For a storage closet not holding classified information but you want to deter entry, which type of key-operated lock should you use?

• A. A built-in lock
• B. A high-security padlock
• C. A digital keypad lock
• D. A magnetic lock

Answer: (A)

For a storage closet where you want to deter entry, the best choice is a built-in lock. It’s integrated into the door or frame, uses a standard key mechanism, and is usually inexpensive and easy to maintain. This setup provides straightforward deterrence—someone will notice that access is locked and will need a key to open it—without the complexity or cost of electronic systems or external hardware.

Reasoning about the other options helps reinforce why this fits the scenario. A high-security padlock is very robust, but it’s an external device that can be bypassed if the hasp or door is compromised, and it requires managing another key for a space that's not necessarily high-security. A digital keypad lock relies on codes and electricity, so it isn’t a key-operated solution. A magnetic lock is typically powered and controlled electronically rather than by a physical key. For a non-classified storage closet, a built-in lock provides adequate deterrence with simplicity and cost-effectiveness.