The correct answer is: B. Alt + Ctrl + Delete
The shortcut key to open a task manager is Alt + Ctrl + Delete. This shortcut key can be used to open the Task Manager, which is a Windows utility that allows you to view and manage running processes, services, and programs.
The other options are incorrect. A. Alt + F1 opens the Help menu in the current program. C. Alt + Tab switches between open programs. D. F1 opens the Help system for the current program.
