In a TMF-enabled environment, what is the primary difference between single and multithreaded
requesters?

A.
Multithreaded requesters must use one TMF transaction per file I/O.

B.
Checkpointing is not possible in multithreaded requesters.

C.
Multithreaded requesters use nowait I/O.

D.
Single threaded requesters specify TMF transaction IDs.