Question: Under what condition is the E-UTRAN allowed to initiate the handover from E-UTRA preparation request procedure to a UE in RRC_CONNECTED state?
Option 1: When the UE is in RRC_IDLE state and receives a paging message.
Option 2: Only when AS (Access Stratum) security has been activated for the UE.
Option 3: Immediately after receiving a MeasurementReport message from the UE, regardless of security status.
Option 4: When CS (Circuit Switched) fallback indication is sent to the UE without considering AS security.
Explanation: The correct answer is Option 2 because E-UTRAN initiates the handover from E-UTRA preparation request procedure only when Access Stratum (AS) security has been activated for the UE, ensuring a secure handover process and highlighting AS security's importance in managing and securing radio resource control procedures in E-UTRA networks.