Which of the following functions is best suited to determine the standard deviation of a sample including logical values and text?

To unlock all of the controls, ____-click the form, and then click Lock Controls on the context menu.

A. double B. triple C. left D. right

If you need to undo an action, press ____ (in Windows).

A. [Alt][U] B. [Alt][Z] C. [Ctrl][U] D. [Ctrl][Z]