Assume we have two machines (A and B) using the same instruction set architecture. For a program with 1 million instructions, A has a clock of 100ps and average CPI of 4 whereas B has a clock of 130ps and average CPI of 3. a. Which machine is faster for this program and by how much? b. If overclocking of the slower machine is possible, what clock frequency should be used to execute the given program to achieve the same execution time as the faster machine