Computer A$,$ with a frequency of $4$GHz$,$ executes a program of $80$ x $109$ cycles. Computer B$,$ with double the frequency of computer A$,$ executes the same program, with $4$ times the number of clock cycles.

a$)$ What is the execution time of the program for computer A$?$

b$)$ What is the execution time for computer B$?$

c$)$ What is the average CPI for computer B if the average CPI for computer A is $2?($Note: You have to assume that both computer systems execute the same number of instructions$)$