Question: What is a prerequisite for a User Equipment (UE) to support an increased number of UTRA carrier monitoring in both RRC_IDLE and RRC_CONNECTED modes?
Option 1: Support for only intra-frequency measurements
Option 2: Capability for reduced transmission power in idle mode
Option 3: Implementation of a specific UE radio access bearer configuration
Option 4: Support for extended number of measurement identities
Explanation: According to E-UTRA specifications, for a UE to support an increased number of UTRA carrier monitoring, it must also have the capability to handle more measurement tasks simultaneously. This is directly linked to supporting an extended number of measurement identities, which enables the UE to monitor multiple carriers efficiently in both idle and connected states.