A qualified applicant may designate a duly authorized agent to pick up and deliver an absentee ballot under this subtitle. An agent of the voter under this section: must be at least 18 years old; may not be a candidate on that ballot; shall be designated in a writing signed by the voter under penalty of perjury; and shall execute an affidavit under penalty of perjury that the ballot was: delivered to the voter who submitted the application; marked and placed in an envelope by the voter, or with assistance as allowed by regulation, in the agent’s presence; and returned to the local board by the agent.