In addition to being managed and alarmed, what else must vital telecommunications facilities be?

Vital telecommunications facilities play a crucial role in the reliable operation of the electrical grid, necessitating that they be tested and/or actively monitored. This ongoing testing and monitoring ensure that these systems function properly and remain resilient under various operating conditions. By implementing consistent testing protocols, operators can identify any potential issues before they escalate into significant problems. Moreover, active monitoring allows for real-time assessment of the systems, ensuring immediate response to alarms and helping to maintain the integrity of telecommunications that support system operations.

In contrast, the other choices, while potentially relevant to operational practices, do not directly address the critical requirement for ongoing reliability and performance assurance of telecommunications facilities. For example, while rating assessments or timely updates are important for certain operational aspects, they do not encompass the immediate functional needs of continuous testing and monitoring required for vital telecommunications infrastructure.