The below table shows four different processors P1, P2, P3, and P4 running four programs and their corresponding clock rates, CPI, and Instruction Count (IC) are given below. Showing all the steps, answer the following. Processor Clock rate CPI IC P1 3.00 MHz 2.00 2,000 P2 2.50 MHz 1.50 3,000 P3 2.00 MHz 2.50 4,000 P4 1.50 MHz 3.00 1,000 a. Compute the CPU time for each of the programs running on P1, P2, P3, and P4. (12 Points) b. If a program that has 2,500 instructions is run on processors P1, P2, P3, and P4, which processor (P1, P2, P3, or P4) has the best performance in terms of CPU time and why? (10 Points)