CompTIA Exam CAS-003 Topic 7 Question 55 Discussion

A penetration tester is trying to 9am access to a bulking after hours as part of a physical assessment of an office complex. The tester notes that each employee touches a badge near a small black box outside the side door and the door unlocks. The tester uses a software-defined radio tool to determine a 125kHz signal is used during this process Which of the following technical solutions would be BEST to help the penetration tester gain access to the building?