Question: Under what condition must an Integrated Access Backhaul (IAB) - Mobile Terminal (MT) in RRC_CONNECTED initiate the Uplink (UL) Information Transfer procedure to transfer F1-C related information?
Option 1: Whenever there is a change in the UE's mobility state
Option 2: Only if Security Mode Command has been successfully executed
Option 3: Only if Signaling Radio Bearer 2 (SRB2) or split SRB2 is established
Option 4: Immediately after transitioning from RRC_INACTIVE to RRC_CONNECTED
Explanation: This is because, as per the specified protocol, an IAB-MT in RRC_CONNECTED must initiate the UL information transfer procedure for transferring F1-C related information only if a specific bearer (SRB2 or its split variant) is established, ensuring a dedicated signaling path for this type of information. This highlights the importance of proper bearer setup for specialized data transfers in telecom networks.