3, (6 points) Consider two different implementations of the same instruction set architecture. The instructions can be divided into four classes according to their CPI (class A, B, C and D). P1 with a clock rate of 3GHz and CPIs of 3,2,1,4, and P2 with a clock rate of 4GHz and CPIs of 2 , 2,2,4 Given a program with a dynamic instruction count of 1.0E5 instructions divided into classes as follows: 20% class A,40% class B,30% class C, and 10% class D. a) Which implementation is faster? b) What is the global CPI for each implementation? c) Find the clock cycles required in both cases