Question: What is the primary purpose of the 'Common Measurement Failure' procedure in UTRAN's Iur interface, as utilized between Radio Network Controllers (RNCs)?
Option 1: To initiate a new set of common measurements for a User Equipment (UE) across different RNCs.
Option 2: To adjust the reporting frequency of ongoing common measurements for better resource allocation.
Option 3: To notify another RNC that a previously requested measurement can no longer be reported by the requesting RNC.
Option 4: To synchronize common measurement configurations among all RNCs within the network.
Explanation: This procedure is specifically designed for an RNC to communicate to another RNC that it cannot fulfill a prior request for a common measurement, highlighting a failure or inability in the measurement reporting process. This ensures transparency and efficient resource management between RNCs, particularly relevant in scenarios where seamless handover or coordinated cell management is crucial.