Question: What is the primary purpose of the `Usage-Monitoring-Report` AVP (AVP code 1069) in the context of Policy and Charging Control (PCC), as signaled from the PCRF to the PCEF?
Option 1: To request a reduction in the frequency of usage updates due to low data volumes.
Option 2: To indicate that the PCEF should only report usage once a predefined threshold is exceeded.
Option 3: To query the current accumulated usage without triggering a reporting action by the PCEF.
Option 4: To instruct the PCEF to report accumulated usage regardless of whether a usage threshold is reached.
Explanation: The correct answer, `USAGE_MONITORING_REPORT_REQUIRED`, signifies that the PCRF mandates the PCEF to report accumulated usage, irrespective of the threshold status. This ensures proactive monitoring and management of resource utilization in telecom networks, aligning with efficient policy and charging control mechanisms.