The Cancel Button’s procedure is accessed by . . . . . . . . key.

The correct answer is A. Esc.

The Esc key is a modifier key on most computer keyboards. It is typically located in the upper left corner of the keyboard, to the left of the F1 key. The Esc key is used to cancel or abort a command or operation. It is also used to exit a program or window.

The Alt key is a modifier key on most computer keyboards. It is typically located to the left of the Spacebar. The Alt key is used to access special characters and functions. It is also used to type alternate characters, such as é and ß.

The Ctrl key is a modifier key on most computer keyboards. It is typically located to the left of the Spacebar. The Ctrl key is used to access special characters and functions. It is also used to type alternate characters, such as á and ñ.

The Shift key is a modifier key on most computer keyboards. It is typically located to the left and right of the Ctrl key. The Shift key is used to type uppercase letters and symbols. It is also used to type alternate characters, such as ! and @.

In the context of the question, the Cancel Button’s procedure is accessed by pressing the Esc key. This is because the Esc key is typically used to cancel or abort a command or operation.