James and Ben Heywood founded ____ in 2004.

Which modifiers to the ps command would show all processes running, the user running it, the processes from all sessions, and a family tree display of them?

A) ax B. ux C. aux D. faux

When you type in a command to your shell, it uses a particular variable to ascertain where to look for that command. What is it, and what happens if it's set to NULL?

What will be an ideal response?