Letter . . . . . . . . is the Exit menu’s access key.

X
Y
Z
W

The correct answer is: X.

The access key is a keyboard shortcut that allows you to select a menu item without using the mouse. To use an access key, press and hold the Alt key, and then press the letter that corresponds to the access key.

In the case of the Exit menu, the access key is X. To select the Exit menu using the access key, press and hold the Alt key, and then press the X key.

The other options are incorrect because they do not correspond to any of the menu items in the standard Windows interface.