MSP和SMSC之间的接口基于（）协议。

A.RA-RNTI
B.preamble
C.TC-RNTI
D.C-RNTI

A.DownstreamOnDemand
B.DataOnDemand
C.DataOfDemand
D.DownstreamOfDemand

A.MultiProtocolLabelSwitching
B.MultiPathLabelSwitching
C.MultiplexLabelSwitching
D.MultiprovisionLabelSwitching