Question: In a 5G NR network, when a User Equipment (UE) receives an `n3c-MappingToAddModList` containing a new `n3c-RemoteUE-RB-Identity`, what action does the UE take regarding the remote UE's Radio Bearer (RB) association?
Option 1: The UE ignores the new identity if it's not part of its current configuration, awaiting further instructions.
Option 2: The UE associates the remote UE's RB with a newly indicated Uu RLC (Radio Link Control) channel as specified in `n3c-RLC-ChannelUu`.
Option 3: The UE updates all existing RB associations to match the new `n3c-RemoteUE-RB-Identity` configuration.
Option 4: The UE sends a confirmation request to the network before making any changes to its RB associations.
Explanation: When encountering a new `n3c-RemoteUE-RB-Identity`, the UE must associate the indicated remote UE's Radio Bearer (RB) with the Uu RLC channel as newly specified in `n3c-RLC-ChannelUu`. This ensures seamless integration of new bearer mappings into the UE's configuration, facilitating efficient data transfer between the UE and the remote entity via the updated RLC channels.