Hardware vs. Software basics.

A package manager is a software tool that maintains a system’s installable packages. Its functions commonly include locating packages in repositories, downloading them, installing files in the proper places, tracking versions, resolving dependencies, applying updates, and removing packages cleanly. It may also verify package metadata or signatures, depending on the platform. These tasks help keep software consistent and reduce manual installation errors. The manager is not a physical mounting device and has no role in folding paper or damaging a keyboard. Although it can install drivers and other system components, it still performs software management. Therefore option A is correct.

A device driver is system software that allows the operating system and a hardware device to communicate. Driver dependency becomes a problem when the driver requires a particular operating-system version, kernel interface, firmware revision, library, architecture, or supporting component that is missing or incompatible. After an update, an older driver may stop working; alternatively, installing an unsuitable driver can cause errors, reduced features, or instability. The issue is therefore one of software compatibility and dependency, not a permanent physical dependence between a monitor and printer or between a mouse and chair. Option A states the valid reason.

The kernel is the core part of an operating system that manages essential resources such as memory, processes, and hardware access. A kernel panic occurs when the kernel detects a severe condition from which it cannot safely continue, such as a critical memory fault, invalid operation, or serious driver and hardware interaction. To prevent further corruption, the system may halt, display an error screen, or restart. This is more fundamental than an ordinary application crash, which usually terminates only one program while the operating system continues. A changing monitor colour, an empty printer, or a washed mouse pad is not a kernel error. Hence option A is correct.