单项选择题

A.SIP eth010.251.251.252;STA eth010.251.251.251
B.SIP eth010.251.251.251;STA eth010.251.251.251
C.SIP eth110.251.251.251;STA eth110.251.251.252
D.SIP eth110.251.251.252;STA eth110.251.251.251