Please match the protocol to the characteristic…

Please match the protocol to the characteristic.

(1)SIP
(2)SCCP
(3)H.323
(4)MGCP
(I)Peer-to-Peer
(II)Client/Server

A.
(I)-(1 2);(II)-(3 4)

B.
(I)-(2 4);(II)-(1 3)

C.
(I)-(1 4);(II)-(2 3)

D.
(I)-(1 3);(II)-(2 4)