6. Consider two different implementations of the same instruction set architecture. The instructions can be divided into four classes according to their CPI (classes A, B, C, and D). Pl with a clock rate of 2.5 GHz and CPIs of 1, 2, 3, and 3, and P2 with a clock rate of 3 GHz and CPIs of 2, 2, 2, and 2. Given a program with a dynamic instruction count of 10 instructions divided into classes as follows: 10% class A, 20% class B, 50% class C, and 20% class D, (a) Which is faster: P1 or P2? (b) What is the global CPI for each implementation