3. Early examples of CISC and RISC design are the VAX 11/780 and the IBM RS/6000, respectively. Using a typical benchmark program, the following machine characteristics result: Processor Clock Frequency (MHz) Performance (MIPS) CPU Time (secs) 12 x 3x 5 Vax 11/780 IBM RS/6000 30 18 The final column shows that the VAX required 12 times longer than the IBM measured in CPU time. a. What is the relative size of the instruction count of the machine code for this benchmark program running on the two machines? b. What are the CPI values for the two machines? 4. Four benchmark programs are executed on three computers with the following results: Computer C 20 Program 1 Program 2 Program 3 Program 4 Computer A 1 1,000 500 100 Computer B 10 1000 1,000 7,000 200 120 100 The table shows the execution time in seconds, with 100,000,000 instructions executed in each of the four programs. Calculate the MIPS values for each computer for each program. Then calculate the arithmetic and harmonic means assuming equal weights for the four programs, and rank the computers based on arithmetic mean and harmonic mean