Suppose 94% of memory accesses for program X are found in L1 cache and the L1 cache access time is 1ns. 4% of the memory accesses for program X are found in L2 cache with an access time of 12ns. The rest of the memory accesses for program X are located in the primary memory (System RAM) with an access time of 90ns. (a) Calculate the average time to access data given above in different memory locations. (b) Explain two reasons why L1 cache memory has higher performance than L2 cache memory. (c) Explain two reasons why L2 cache memory has higher performance than main memory (System RAM).