Which statement best describes the range of forms that combination locks can take?

• A. They can be mechanical or electromechanical built-in locks, or portable padlocks.
• B. They must be built-in locks only.
• C. They cannot be used on portable devices.
• D. They are only used in residential settings.

Answer: (A)

Combination locks come in a variety of forms to fit different security needs. They can be mechanical, using rotating dials to align wheels, or electromechanical, blending electronic control with a locking mechanism. They also appear as built-in locks integrated into doors, safes, or lockers, as well as portable padlocks you can carry with you. This range covers both fixed installations and portable options, across different mechanisms.

So, the statement that best describes their range is that they can be mechanical or electromechanical, and can be either built-in or portable. The other ideas are too restrictive: locks aren’t limited to built-in installations, they can be used on portable devices, and they aren’t confined to residential settings.