A Systems Administrator Notices Several Intensive Tasks Executing from Users

Multiple Choice

A systems administrator notices several intensive tasks executing from users Joe and Ann. These processes are impacting server operations but must be allowed to continue running. Which of the following commands should the systems administrator run to reduce the impact on the server?

A) pkill -u joe ann
B) renice 11 -u joe ann
C) nohup -u joe ann
D) strace -u joe ann