What characterizes a recurring AD?

A recurring AD (Advisory Directive) is characterized by its repetitive nature, which stems from the ongoing condition it addresses. When a specific issue in a system or process continues to occur, an AD may be issued that outlines how to handle or rectify the situation each time it arises. This is particularly relevant in contexts where certain problems are predictable and require regular attention.

The choice that states it is routine every month may not accurately describe all recurring ADs, as they can occur at varying intervals depending on the specific issue. Similarly, a one-time fix would not be characterized as recurring since it is designed for a singular incident rather than ongoing situations. Lastly, an AD that becomes irrelevant over time does not align with the concept of recurrency, as that implies the directive will continue to be useful until the underlying issue is resolved. Hence, the correct characterization of a recurring AD is indeed that it is repetitive due to the nature of the condition it is meant to address.