Which option describes a CCTV system?

• A. A system that captures images, converts to a video signal, and transmits it to a monitoring station
• B. A system that stores audio recordings
• C. A system used to monitor and transmit video for security surveillance
• D. A system that controls door locks

Answer: (C)

A CCTV system is defined by its role in security surveillance: monitoring a space by transmitting video to a monitoring location so security personnel can observe in real time or review later. The description that matches this purpose states that it is a system used to monitor and transmit video for security surveillance, which directly captures the function of CCTV.

Other options touch on related technologies but not the core idea: storing audio recordings isn’t about video surveillance, and a system that controls door locks relates to access control rather than video monitoring. While one choice mentions capturing images and sending a video signal, it doesn’t explicitly emphasize the ongoing monitoring and security surveillance focus that CCTV is built around.