A Linux User Reports That an Application Will Not Open

Multiple Choice

A Linux user reports that an application will not open and gives the error. Only one instance of the application may run at one time. A root administrator logs on to the device and opens a terminal. Which of the following pairs of tools will be needed to ensure no other instances of the software are currently running?

A) pad and chmod pad and chmod
B) sudo and vi sudo vi
C) ls and chown ls chown
D) ps and kill ps kill
E) cp and rm cp rm