Following combination of keys is used to maximize or restore a selected window:
A. CTRL+F1
B. CTRL+F5
C. CTRL+F10
D. CTRL+F12
To maximize or restore a selected window press CTRL+F10. Press Space to make selections, such as placing a checkmark in a check box. With the object highlighted, press Shift + F10 (Function key F10). Press the arrow keys to move through the menu.