Question: What type of F1-U tunnel is used between the gNB-CU and the gNB-DU for MRB with PTM transmission?
Option 1: UE dedicated F1-U tunnel
Option 2: Shared F1-U tunnel with DL GTP-U TEID
Option 3: Shared F1-U tunnel
Option 4: Either a shared or UE dedicated F1-U tunnel, dependent on the lower layer configuration
Explanation: According to the overall architecture of NR MBS, a shared F1-U tunnel is used between the gNB-CU and the gNB-DU for MRB with PTM transmission. This allows for efficient transmission of multicast and broadcast data.