Question: Under what condition can the Network initiate the establishment of RBs (other than SRB1) for a UE in RRC_CONNECTED state?
Option 1: When the UE is in RRC_IDLE state
Option 2: When AS (Access Stratum) security has not been activated yet
Option 3: When only SRB2 with at least one DRB or multicast MRB are setup and not suspended
Option 4: When AS (Access Stratum) security has been activated
Explanation: The correct answer is because, for a UE in RRC_CONNECTED state, the establishment of RBs (other than SRB1) requires AS security to be activated, ensuring secure communication before additional radio bearers are set up.