Question: In which mode can the UE radio capability ID IE be included, given that both the UE and the network support RACS?
Option 1: WB-S2 mode
Option 2: WB-S1 mode
Option 3: NB-S1 mode
Option 4: NB-S2 mode
Explanation: The UE radio capability ID IE can be included in WB-S1 mode if both the UE and the network support RACS, as this allows the network to assign a network-assigned UE radio capability ID to the UE.