3. Consider two different implementations of the same instruction set architec- ture. There are four classes of instructions A, B, C, and D. The clock rate and CPI of each implementation are given in the following table. Clock rate CPI Class A CPI Class B CPI Class C CPI Class D P1 1.5 GHz 1 2 3 4 P2 2 GHz 2 2 2 2 (a) What is the clock cycle time for each processor? (b) Given a program with 106 instructions divided into classes as follows: 10% class A, 20% class B, 50% class C, 20% class D. What is the CPI for each processor