Question: What condition must be met before the Network can initiate the establishment of RBs (other than SRB1) for a UE in RRC_CONNECTED state?
Option 1: The UE must have at least one active DRB.
Option 2: The UE must have AS security activated and at least one RLC bearer setup in SCG.
Option 3: The Network must have AS security activated.
Option 4: The UE must be in RRC_IDLE state.
Explanation: According to the 3GPP specification, the establishment of RBs (other than SRB1) is performed only when AS security has been activated. This ensures that the network can securely establish and manage radio bearers for the UE.