You are responsible for maximizing the utilization of computing resources for a large scale multi user system. You are receiving complaints from most users about response and turn around times when accessing the server. Investigations reveal the CPU is being utilized only 20% of time. Which of the following could be reasons for the poor CPU utilization? Explain why do you choose them and not the others.

a) Insufficient Memory

b) Frame Size too small

c) too much memory

d) one CPU is not enough