What type of action is meant as a temporary measure when a problem in a plant has been identified?

The correct choice refers to an "interim action," which is specifically designed to address an identified problem in a plant on a temporary basis. This type of action is often implemented while a more permanent solution is being developed and finalized. Interim actions are critical in managing risks, maintaining safety, and preventing further issues until a comprehensive strategy can be carried out.

In many operational contexts, the urgency of addressing a problem means that immediate steps must be taken to ensure that ongoing operations can continue safely and effectively. An interim action provides that immediate response, ensuring that the system or plant can remain operational while long-term solutions are formulated.

The other options, while they might seem related, do not capture the essence of a temporary measure in the same way. Mitigating actions often involve measures aimed at reducing the severity or impact of a risk or problem, but they are not solely temporary and may include long-lasting strategies. Adaptive action refers more to adjusting procedures or systems in response to changing conditions, which may not necessarily be temporary. Short-term action can imply a range of strategies but does not inherently carry the specific connotation of being a temporary solution to an immediate problem as "interim action" does.