The computer spends 75% of the time computing and 25% waiting for the disk. The instruction mixes and the average cycles per instruction (CPI) for each type is: 3. Type of instruction of CPI of instructions Instructions Integer Floating point Others 35 31 40 12 25 4. Consider 3 modifications to the computer. Compute the specdup for each. a. The processor is replaced with a new one that reduces the total computation time by 30%. b. The disk is replaced with a solid-state device that reduces the disk waiting time by 70% C. The processor is replaced with a new one that has improved floating point performance The average floating-point CPI is reduced by 4; all other aspects are unchanged. d. Which modification gave the best speedup?

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