The quickest ways to switch between application windows on a computer from the provided options are:
C. Press Alt-Tab together to switch between applications.
D. Press Ctrl-Alt-Tab to see all open applications.
Option A: Minimize all applications so you can search for the application you want in the taskbar.
Option B: Click the show desktop icon on the taskbar to minimize all applications into the taskbar.
Option C: Press Alt-Tab together to switch between applications.
Option D: Press Ctrl-Alt-Tab to see all open applications.
In conclusion, options C and D are the most effective ways to quickly switch between application windows.