कैश मेमोरी ऑर्गनाइजेशन में, 'लोकेलिटी ऑफ रेफरेंस' (locality of reference) मुख्य रूप से किसे संदर्भित करता है?

If the CPU finds the required data in the cache memory, which of the following terms is used?

Assume a main memory access on a cache miss takes 30 ns and a cache access on a cache hit takes 3 ns. If 80% of the processor's memory requests result in a cache hit, what is the average memory access time?