You are developing a BizTalk Server 2010 orchestration that processes messages received from the BizTalk FILE adapter. You need to retrieve the original file name of the message and store it in a variable named FileName for future processing. What should you do?

A.
Inside a message assignment shape in the BizTalk Orchestration Designer, use the WSS.Filename context property to assign the FileName variable.

B.
Inside an expression shape in the BizTalk Orchestration Designer, use the LEGACY.FilePath context property to assign the FileName variable.

C.
Inside a message assignment shape in the BizTalk Orchestration Designer, use the BTS.MessageType context property to assign the FileName variable.

D.
Inside an expression shape in the BizTalk Orchestration Designer, use the FILE.ReceivedFileName context property to assign the FileName variable.