Question: Upon receiving a RadioBearerConfig IE with an `srb-ToAddModList`, what action must the User Equipment (UE) perform according to the RRC protocol specification?
Option 1: Perform SRB release as specified for `srb3-ToRelease`
Option 2: Perform SRB addition or reconfiguration as specified for `srb-ToAddModList` or DAPS bearer configuration
Option 3: Release all SDAP entities established for PDU sessions without an associated DRB
Option 4: Initiate a random access procedure to synchronize with the base station
Explanation: When the UE receives a RadioBearerConfig IE that includes the `srb-ToAddModList` or configures any DAPS bearer, it is instructed to perform SRB (Signaling Radio Bearer) addition or reconfiguration. This action updates signaling bearers for new or modified signaling requirements between the UE and the network, ensuring proper communication for control plane messages, impacting the management of signaling resources.