"SGW和PGW S5/S8协议栈自上而下正确的顺序是()

"SGW和PGW S5/S8协议栈自上而下正确的顺序是()

A.GTP/UDP/IP/L2/L1

B.GTP/TCP/IP/L2/L1

C.GTP/SCTP/IP/L2/L1

D.GTP/RLC/MAC/L1"

正确答案是A