Which of the following statements about 5G NG-RAN is FALSE?

A. The Xn interface is used to connect gNB to ng-eNB.

B. The NG interface is used to connect ng-eNB to UPF.

C. The Xn interface is used to connect ng-eNB to AMF.

D. The NG interface is used to connect gNB to NGC.

Reference:
https://www.etsi.org/deliver/etsi_ts/138400_138499/138401/15.02.00_60/ts_138401v150200p.pdf (12)