Hardware vs. Software basics.

Direct memory access can help fast data transfer between hardware and memory. For exams connect it with performance.

Polling and interrupt are methods of input output management. For exams connect event response with interrupt.

A device controller can be a hardware part that helps operate a device. For exams distinguish controller and driver.

A driver helps the operating system communicate with the hardware controller. For exams place driver on the software side.

A buffer helps manage data between fast and slow components. For exams understand it as temporary holding.

A print buffer manages data according to printer speed. For exams remember the role of spooler and buffer in printing.

The direct answer is option A. Cache and buffer are both temporary memory areas, but they solve different problems. A cache keeps copies of data that is likely to be used again, so the processor or program can obtain frequently needed data faster. A buffer temporarily holds data while it moves between devices or processes that work at different speeds. For example, a printer buffer can hold a document while the printer prints it. Thus option A correctly states that cache speeds repeated access and buffer manages temporary transfer. Option B is wrong because a cache and a buffer are not a printer and a monitor; those are output hardware devices. Option C is nonsensical: neither term means a chair. Option D is also unrelated because neither term means a pen-drive colour. The difference is based on purpose, not on physical colour or a particular device. Cache focuses on faster reuse; buffer focuses on smooth movement and temporary waiting during transfer. Memory cue: cache means “use again quickly”; buffer means “hold while moving.”

Memory management unit helps with addresses and memory access. For exams connect it with hardware and operating system relation.

Virtual address makes memory simpler from a program view. For exams keep real and logical addresses separate.

Paging is a memory management technique of an operating system. For exams connect it with RAM and virtual memory.

Swapping can use storage as support when RAM is low. For exams understand it as a technique that can affect performance.

Repeated dependence on storage can reduce speed. For exams remember the relation between low RAM and swapping.

A cache is a faster temporary storage area that keeps copies of data likely to be requested again. A file cache can retain recently accessed file contents or metadata, allowing the system to serve a repeated request from the cache instead of retrieving everything from slower storage or another location. This reduces access time and can improve perceived performance, although the cache has limited capacity and may become invalid when the original file changes. It does not add physical weight, fold a monitor, or require liquid for a keyboard. Therefore option A states the main benefit correctly.

Disk scheduling can help improve storage performance. For exams connect it with operating system management work.

Input output scheduling manages device work more efficiently. For exams connect it with system software management.

Device file lets software talk to hardware in a standard way. For exams treat it as a system interface concept.

After mounting the system can access files on storage. For exams do not treat mount only as physical fixing.

Unmounting can reduce risk of data loss. For exams connect it with safely removing a pen drive.

Some hardware can be connected while the system is running. For exams use USB devices as simple examples.

Plug and Play makes device detection easier and hot plugging relates to connection while running. For exams keep both terms separate.

Bus architecture describes communication paths between hardware components. For exams connect it with data communication.

Chipset helps communication among many hardware components. For exams understand motherboard as a connection center not only a board.

Graphics processing unit does visual processing and driver runs it with the system. For exams identify hardware and control software pair.

Graphics processing unit is special hardware for visual tasks. For exams understand performance improvement through special hardware.

An outdated graphics driver can affect display or video performance. For exams connect driver update with performance and compatibility.