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