Computers A and B have the same ISA, but have different implementations. Computer A Computer B Program P1 Clock Frequency 2.4 GHz 3.3 GHz CPI for Instruction Class C1 4 5 40% CPI for Instruction Class C2 3 5 20% CPI for Instruction Class C3 4 6 30% CPI for Instruction Class C4 3 2 10% (a) Calculate the CPIAVG for program P1 on each computer. (b) For program P1, determine which computer executes faster and by how much. (c) You want to improve the performance of computer A. You found a method to half the CPI of an instruction class, but the method can be applied only to a single class.