A computer has a L1-cache, L2-cache, L3-cache, and main memory. If a referenced word is in the o L1-Cache, 5 ns are required to access it o L2-Cache, but not in the L1 cache, 10 ns are required to load it into the L1-cache and reference is started again o L3-Cache, but not in the L2 cache, 20 ns are required to load it into the L2-cache and reference is started again o Main memory but not in the cache, 60 ns are required to load it into the L3-cache and reference is started again o The L1-cache hit ratio is 0.9, L2-cache hit ratio is 0.8, and L3-cache hit ratio is 0.6 A. If the word is found in L1 cache, how much is the access time? (2 Points) B. If the word is found in L2 cache, how much is the access time? (2 Points) C. What is the average time in nanoseconds required to access a referenced word on this system? (6 Points)