What is the effective memory access time for a memory hierarchy consisting of

a) an L1 cache with the hit time of 1ns and miss rate of 0.01

b) an L2 cache with the hit time of 30ns and local missrate of 0.2.

c)and a main memory with the hit time of 100ns

options:

1)1.43ms

2)1.43ns

3)2.45ns

4)3.03ns

5)none of the above