[Problem 3] Suppose a program has the following instruction classes, CPIs, and mixtures: Instruction Class CPI Percentage A 1.4 55% B 2.4 10% C 2 35% There are the following options: Option A: Reduce the CPI of instruction type A to 1.1 Option B: Reduce the CPI of instruction type B to 1.2 of the two options (A or B), which is better? [Problem 4] Suppose one machine, A, executes a program with an average CPI of 2.0. Suppose another machine, B (with the same instruction set and an enhanced compiler), executes the same program with 25% fewer instructions and with a CPI of 1.5 at 500MHz. In order for the two machines to have the same performance, what does the clock rate of the first machine (machine A) need to be