Which of the Following Techniques Always Toggles the "On" and "Off

Multiple Choice

Which of the following techniques always toggles the "on" and "off" states of a radio button control?

A) Click on the circle or its caption with the mouse.
B) Press the spacebar when the circle has the focus.
C) Press on another radio button in the same group box.
D) Set the Checked property equal to True.
E) None of the above