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Consider two different implementations of the same instruction set architecture. There are four classes of instructions A, B, C, and D. The clock rate and CPI of each implementation are given in the following table. Must show calculations for credit. Clock Rate CPI Class A CPI Class B CPI Class C CPI Class D P1 1.5 GHz 4 2 3 1 P2 2 GHz 1 3 3 3 a) Given a program with 106 instructions divided into classes as follows: 10% class A, 20% class B, 50% class C, and 20% class D, which implementation is faster? b) What is the global CPI for each implementation? If a computer connected to a 1 gigabit Ethernet network needs to send a 256 Kbytes file, how long would it take