Before accepting responsibility, what must be ensured by the relieving specialist?

Ensuring that all unresolved questions are answered is crucial before accepting responsibility. This is because unanswered questions can lead to misunderstandings or incomplete information, which can significantly impact the operation's safety and efficiency. A relieving specialist must clarify any uncertainties regarding ongoing situations, procedures, or equipment status to maintain operational continuity and minimize the potential for errors. By addressing unresolved questions, the specialist confirms they have a complete understanding of the current conditions and can make informed decisions moving forward.

The other options, while important in various contexts, do not necessarily represent primary responsibilities before assuming a position. Functional equipment is essential but may not always be verifiable at the moment of turnover. The position being vacant may be a logistical issue but does not directly relate to the knowledge and preparedness required for effective transition. Ensuring all personnel are accounted for is also important but is secondary to the need for clarity on operational questions that might affect immediate responsibilities.