Exercise 3: Three benchmarks (Programs) are used to assess the performance of 4 computers. The execution time results (in second) are a- Compute the total execution time for each computer. b- Compute the arithmetic average of execution time for each computer. c- Sort the computers A - D depending on their performance from the best to the worst. d. Given the Bench 1 has 100000000(10) instructions, compute the rate (MIPS) of computer A