Question: What happens when a UE in RRC_CONNECTED initiates an RRC connection re-establishment procedure and the network is able to find and verify a valid UE context?
Option 1: The network discards the stored AS Context and releases all RBs and BH RLC channels.
Option 2: The UE moves directly to RRC_IDLE with release cause 'other'.
Option 3: The network re-activates AS security without changing algorithms, re-establishes and resumes SRB1, and continues the RRC connection.
Option 4: The UE initiates a new RRC connection establishment procedure.
Explanation: According to the 3GPP specification, when the network retrieves or verifies the UE context during an RRC connection re-establishment procedure, it applies the procedure by re-activating AS security without changing algorithms and re-establishing and resuming SRB1. This allows the UE to continue the RRC connection.