The performance of cache memory is frequently measured in terms of a quantity called ________.

Correct option is C

The performance of cache memory is frequently measured in terms of a quantity called the hit ratio. The hit ratio is the fraction of all memory accesses that are satisfied by the cache, meaning the data was found in the cache memory. A higher hit ratio indicates better cache performance, as it means the majority of data accesses are being handled by the faster cache memory rather than the slower main memory.