4. 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 2.5 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 1.0E6
instructions divided into classes as follows: 10% class A, 20% class
B, 50% class C, and 20% class D, Which is faster: P1 or P2?