2. [20] S1.6 Consider two different implementations of the same 1nstruction set archi tecture. The 1nstructions can be divided into four classes according to their CPI(class A, B, C, and D). P1 with a clock rate of 2.5 GHz and CPIs of 1, 2, 3, and 3, and P2 with a clock rate of 3GHz and CPIs of 2, 2,2, and 2 Given a program with a dynamic instruction count of 1. 0E6 instructions divided into classes as follows: 10% class A, 20% class B, 50% class C, and 20% class D, which implementation is faster'? a. What is the global CPI for each implementation? b. Find the clock cycles required in both cases