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). P1 with a clock rate of 2.8 GHz and CPIs of 1, 3, 2, and 3, and P2 with a clock rate of 3.1 GHz and CPIs of 2, 1, 2, and 1. Given a program with a dynamic instruction count of 1.0E6 instructions divided into classes as follows: 15% class A, 15% class B, 40% class C, and 30% class D: a) What is the global CPI for each ISA implementation