What is the shortcut key to display field codes?

What is the shortcut key to display field codes?A. Alt + F9
B. Ctrl + F9
C. Shift + F9
D. Space + F9

Alt+F9 – View field codes – toggles field code display for all fields in the entire document. Ctrl+Shift+F9 – Unlink fields – converts all qualifying fields in the selection into hard text; once this action is done, the field can’t be updated any more.