Which combination of activities is permissible for an inspection authorization holder?

An inspection authorization (IA) holder has specific privileges that allow them to perform and supervise inspections, ensuring compliance with Federal Aviation Administration (FAA) regulations. The correct answer indicates that they can supervise annual inspections and perform progressive inspections.

The ability to supervise annual inspections is crucial because it allows the IA holder to ensure that these comprehensive assessments of an aircraft's airworthiness can be conducted properly. Annual inspections are significant for maintaining safety standards, and having an IA supervise these inspections ensures adherence to regulatory requirements.

Performing progressive inspections is also within the scope of an IA holder's privileges. Progressive inspections are methods that permit an aircraft to be inspected in smaller, more manageable stages, which can be particularly useful for aircraft that are in service frequently. This flexibility supports ongoing maintenance strategies and helps prevent aircraft downtime.

In contrast, other activities listed do not accurately reflect the scope of activities permissible for an IA holder. For instance, performing only annual inspections does not encompass the broader range of capabilities the IA may possess in supervising and conducting inspections throughout the year. Furthermore, the phrase "assist in all types of aircraft repairs" is too vague and does not specifically address the supervisory or inspection functions critical to an IA's responsibilities. Therefore, the combination of supervising annual inspections while performing progressive inspections