What is the correct way to forcefully quit an unresponsive application?

C$.$ Select the application name from the menu and then select Quit $[$application name$]$

B$.$ Select File $>$ Close or File $>$ Exit from the menu.

A$.$ Select File $>$ Quit from the menu.

D$.$ Press Ctrl $+$ Alt $+$ Delete and choose End Task from the Windows Task Manager.