Problem #3 Consider a machine with four instruction classes, whose CPI and code size (IC) for cach instruction class for a program are given below Instruction CPI for the IC for the class instruction instruction class Millions) 900 500 100 200 class ALU Load Store Branch (i) (ii) Find the execution time on a 3GHz processor What is the speedup if the number of ALU instructions can be reduced by one-quarter