Consider a multiprogramming system with $4$ processes, A$,$ B$,$ C$,$ and D that arrived at the same time.

Processes A and B are CPU$-$bound ones, while processes C and D are I$/$O$-$bound ones. Their resources

requirements are given in the table below. Assume that process A uses $80\%$ of the CPU while running,

process B uses $80\%$ of the CPU while running, process C uses $10\%$ of the CPU while executing I$/$O$,$ and

process D uses $10\%$ of the CPU while executing I$/$O$.$