From the description given, it is clear that the answer to the question is (C) Madalyn works in Security and Protective Services, and Robert works in Law Enforcement Services.
Madalyn might be working as a security guard in a private corporation since she is responsible for monitoring the camera alarm system for intruders as well as patrolling the area. Robert might be working as a police officer since he is responsible for observing and arresting crime suspects.
