Consider three different processors P1, P2, and P3 executing the same instruction set. P1 has a 3.7 GHz clock rate and a CPI of 2.5. P2 has a 2.50 GHz clock rate and a CPI of 1.5. P3 has a 3.5 GHz clock rate and has a CPI of 2.4. (Question derived from question 1.5 in "Computer Organization and Design") a. Which processor has the highest performance expressed in Instructions per second? (Answer should be P1, P2, or P3) ab b. If the processors each execute a program in 15 seconds, find the number of instructions that each processor performs in these 15 seconds. The answer format should be X.XX x 10Ay. Please use this format exactly. For processor P1? ab For processor P2? For processor P3? ab We are trying to decrease the execution time of P3 by 40% (60% o the original time), but this leads to an increase of 25% in the CPI of P3. What clock frequency would P3 need to operate atto obtain this performance speed up of P32 Answer should be in the format X.XX in GHz) ab