單項(xiàng)選擇題

Iu-PS用戶面接口協(xié)議自下往上分別是()

A.物理層/ATM/AAL5/IP/TCP/GTP-U/Iu-UP
B.物理層/ATM/AAL5/IP/UDP/GTP-U/Iu-UP
C.物理層/ATM/AAL2/IP/TCP/GTP-U/Iu-UP
D.物理層/ATM/AAL2/IP/UDP/GTP-U/Iu-UP

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