Q2. Given two machines A and B running at 1GHz and 1.1GHz respectively. Assume these machines have the following four instructions: INT, FP, BR, and MEM. The CPI for each instruction is listed below. MACHINE INT FP BR MEM A 8 1 B 10 2 2 Also, the instruction breakdowns of program X and Y (same total number of instructions - Z) are shown below. PROGRAM INT FP BR MEM X 40% 20% 30% 10% Y 20% 30% 10% 40% a. Which machine is faster when only running X? b. Which machine is faster when only running Y? c. Which machine is faster on average (which averaging method should be used?)? d. What is the speed up on the average case (i.e., CPUTime_slower / CPUTime_faster)