单选题：Consider a demand-paging system. For each of the following case

Consider a demand-paging system. For each of the following cases, what is the proper measure to improve the overall system utilization?

CPU utilization 70%, disk utilization 3% ____@[D](1)
A. increasing multi-programming degree
B. decreasing multi-programming degree
C. loading in more CPU-bound processes
D. loading in more I/O-bound processes



A.increasing multi-programming degree
B.decreasing multi-programming degree
C.loading in more CPU-bound processes
D.loading in more I/O-bound processes


答案：D