Final answer:
The middle of a room should be searched intermittently with the perimeter search.
Step-by-step explanation:
The middle of a room should be searched intermittently with the perimeter search. When conducting a search, it is important to cover all areas of the room, including the middle. By searching the perimeter first, you establish a baseline and ensure that no immediate threats or items of interest are on the outer edges. However, it is also necessary to search the middle of the room periodically to ensure thorough coverage.