6. Suppose that the function unit times are given as follows: (1 ns = 109 seconds) 2 ns for memory access, I ns for ALU operation, and 0.5 ns for register file read or write, (A) According to our design, what is the desirable clock rate for the single-cycle machine and the pipelined machine, respectively? (6%) (B) What is the execution time for running the following codes on the single-cycle and the pipelined machine, respectively? (6%) aub $3, $4, $5 $4, 10 ($6) $7, $3, $4 3w $7, 20 ($6) add $7, $2, $1 lw Cadd