Question: In a 5G New Radio (NR) network, as per the RRC protocol specification, what are the possible synchronization reference types indicated by the SL-TypeTxSync information element?
Option 1: eNB, UE, Satellite
Option 2: GNSS, GNB/eNB, UE
Option 3: Small Cell, Macro Cell, Femto Cell
Option 4: TDD, FDD, HD-FDD
Explanation: The correct answer is Option 2 because the RRC protocol specification for NR defines three synchronization reference types for SL-TypeTxSync: GNSS (utilizing satellite signals), GNB/eNB (indicating synchronization with a gNodeB or eNodeB for interoperability), and UE (referencing the user's device for sidelink communication scenarios).