The dentist provides when he or she is physically in the same treatment area overseeing an expanded-function procedure.

The correct answer is- direct supervision

Explanation:

A dentist is said to be providing direct supervision when the dentist is present physically in the same treatment area where the patient is present after examined the patient and he authorizes the procedure that has to be performed in the treatment area and is available all the time in the treatment area during the procedure.  

So in direct supervision, the dentist takes full professional responsibility for the treatment and procedure followed under him or her. So the correct answer is direct supervision.

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i believe the answer would be 'd'.

hope this !