Which of the following will accomplish this?

A system is running slowly and the administrator wants to find the process that is using the MOST resources. Which of the following will accomplish this?

A.
Use op to list processes ranked by CPU utilization.

B.
Use obs to list CPU-intensive processes in order.

C.
Use is free to list processes with the highest foreground priority.

D.
Use ice -l -n 1 to list the process with highest CPU utilization.