Answer: Person holds a license
Explanation:
License is the official document that allows a person to do something , hold a position,own something in legal manner.The person is legally authorized and permitted and thus, cannot be considered to breaking regulation or law as being a license older.
According to the question, if Mark wants to hire other person for handling assessment protest then he should check whether that person has appropriate license for the task .This will verify that he/she is legally permitted to perform assessment protest.