A secure lab facility would like to implement a simple security system intended to ensure that the door to a high-security area isn't accidentally left open. The door is equipped with a single door-open sensor, which produces a logic '1' if the door has been left open, and a logic '0' otherwise.
Which of the following security measures could be implemented based on the door-open sensor?
A) Install a fingerprint scanner.
B) Implement a motion-activated alarm system.
C) Set up a CCTV camera surveillance.
D) Activate an automatic door-closing mechanism.
