Final answer:
A qualification code is a three-digit code that identifies personnel with special training or experience to meet contingency and base-level requirements.
Step-by-step explanation:
The correct answer is C. Qualification code. A qualification code is a three-digit code that identifies personnel with special training or experience to meet contingency and base-level requirements. It is used to determine if individuals have the necessary skills and qualifications for specific tasks or jobs. For example, in the military, qualification codes are often used to designate personnel with specialized training in areas such as medical, engineering, or communication.