When balancing cost and function of access control needs for a single person office where...

For a single-user office, the most cost-effective and functional choice is a key lock. Other options (keypad, badge, biometric) are appropriate for higher-security or multi-user access points but are excessive in cost and complexity for one occupant.

B. Key lock (Correct): Meets the requirement simply and inexpensively.

A. Keypad lock: Adds unnecessary technology and cost.

C. Biometric lock: High cost, appropriate for sensitive areas only.

D. Badge access lock: Requires system integration and ongoing management not justified for a single office.