Question: Under what RRC (Radio Resource Control) mode(s) must a UE (User Equipment) perform logging of MBSFN (Multimedia Broadcast Single Frequency Network) measurement results if the configuration for logged MBSFN measurements is valid?
Option 1: Only in RRC_IDLE mode
Option 2: Only in RRC_CONNECTED mode
Option 3: In both RRC_IDLE and RRC_CONNECTED modes
Option 4: Neither in RRC_IDLE nor RRC_CONNECTED mode, but only in camped normally state
Explanation: According to the specifications for logged measurements, if the configuration for logged MBSFN measurements is valid, the UE is required to perform logging of measurement results not just in RRC_IDLE mode, but also in RRC_CONNECTED mode. This ensures comprehensive logging across different operational states of the UE, enhancing network optimization and troubleshooting capabilities.