Assume a CPU has a base CPI of 1 and a frequency of 2GHz, and that main memory accesses take 50ns and that 40% of all instructions access data memory. Consider the following for that CPU: L1D cache: size of 4KiB, 10% miss rate, and the hit time is 0.5ns 1) What is the average memory access time? Now, consider adding the following to that CPU: L2 cache: size of 2MiB, 90% miss rate, and the hit time is 10ns 2) What will be the average memory access time? 3) Which one has a better performance, with or without L2 cache? and Why? Note: Be specific to get full credit