What is the purpose of ECC memory?

Correct answer: To detect or correct memory errors

Direct answer: Option A is correct. ECC means Error-Correcting Code. ECC memory stores extra checking information along with ordinary data. Step by step: data is written into memory; additional bits are calculated and stored; when the data is read, the memory controller checks the data against those bits; some errors, commonly single-bit errors, can be corrected, while other errors can at least be detected. Thus ECC improves reliability and helps prevent silent corruption. Option A is correct because detecting or correcting memory errors is the purpose of ECC. Option B is wrong because display brightness is controlled by a monitor or graphics settings, not ECC memory. Option C is wrong because ECC cannot change a printer into a scanner; those are different devices and functions. Option D is wrong because washing a mouse pad is cleaning, not memory error control. ECC is useful where reliability matters, such as servers. Memory cue: ECC means extra checking bits for safer memory data.