An important part of a well-written behavior plan is setting forth a protocol for what to do if the unwanted behavior occurs. this may also be called all of the following

Exigency plan.

Explanation:

A Behavioral plan is described as the plan that describes the path or route to be followed(that involves a list of actions) in order to prevent a challenging or problematic behavior and reinforce a positive or rewarding behavior in its place.

As per the question, 'one of the significant elements of a well-drafted behavior plan sets forth a protocol for the actions to be done when an unwanted or challenging behavior is experienced or faced by the patient' could be described as all the given options except for 'exigency plan' as it is associated with the 'presence of mind to take actions required in emergency situations'. Here the pre-determined actions(instead of prompt actions that occur naturally) are suggested to avoid the unwanted behavior. Thus, 'exigency plan' is the answer.

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