https://www.youtube.com/watch?v=zZ3EwOQo6Hw&t=81s

there are different sensor types that can indeed report back to a centralized monitoring station. Definitely going with B. makes the most sense. A and B are addressing the perimeter... D is not better than B. B is correct.

All three other answers are perimeter security. The only option that is not is B. Ground Sensors. A. Perimeter security: Installing fences, gates, surveillance cameras, and access control systems to secure the external area around the cable ingress point and the entire data center facility. D. Perimeter Cable management: Implementing proper cable management practices, including secure enclosures, cable trays and conduits C. Perimeter Regular inspections and maintenance: Conducting regular inspections and maintenance of the cable ingress point and the surrounding areas to identify and address any potential security vulnerabilities promptly.

I believe it is C, this is more tricky question rather than effective control. "inside the perimeter of a facility" and "most effective", assuming that inside the facility perimeter you already have enough access controls etc... a regular sweeps of the perimeter should be more than enough.

B. Ground sensors installed and reporting to a security event management (SEM) system

The MOST effective control to monitor the security of buried data lines inside the perimeter of a facility is B. Ground sensors installed and reporting to a security event management (SEM) system. Ground sensors are devices that can detect vibrations or other disturbances in the ground. When a ground sensor is triggered, it sends an alert to a security event management (SEM) system. The SEM system can then notify security personnel of the alert, so they can investigate the situation.

I think the keyword in this question is "buried data lines" in the facility. It means cable, I think.... so I will go to C

There is literally 2 pages dedicated to CCTV cameras in the Official Study Guide. PG 460 includes "Video surveillance, video monitoring, closed-circuit television (CCTV), and security cameras are all means to deter unwanted activity and create a digital record of the occurrence of events. Cameras should be positioned to watch exit and entry points allowing any change in authorization or access level. Cameras should also be used to monitor activities around valuable assets and resources as well as to provide additional protection in public areas such as parking structures and walkways."

Most effective is definitely sensors. It will occur more frequently and reliably than regular manual checks/sec guard

B.is the likely answer Ground sensors installed and reporting to a security event management (SEM) system is the most effective control to monitor the security of buried data lines inside the perimeter of a facility. Ground sensors can detect any unauthorized digging or excavation near the buried data lines, and by reporting to a security event management system, the security team will be alerted immediately to any potential threats. CCTV cameras and regular perimeter sweeps can help to detect and deter intruders, but they may not detect digging or excavation near the buried data lines. Steel casing around the facility ingress points can provide a level of physical protection, but it may not detect or deter unauthorized access to the buried data lines.

I agreed with C. Ground sensor is detective control and may generate false positive alert while sweeping the perimeter regularly and inspecting all the cable's ingress points manually would be more preventive and most effective comparing to other choices.

keyword in the question being "monitor" - sensors are able of monitoring vs checks.

Correct