对于一个正常的移动台主叫流程，下面的信令流程先后次序正确的是（）

A.OriginationMessage->CMServiceRequest->Allocation->Establish->AssignmentComplete->TchPreamble

B.OriginationMessage->CMServiceRequest->TchPreamble->Establish->AssignmentCompleteAllocation

C.OriginationMessage->CMServiceRequest->Establish->Allocation->TchPreamble->AssignmentComplete

D.OriginationMessage->CMServiceRequest->Establish->AssignmentComplete->Allocation->TchPreamble