The statement has been made more than once that there are no universal joints (cross type joints) in the drive lines that are the subject of this thread.
The statement has also been made that there is a center bearing in the drive lines in question.

If there is(are) no universal joint(s) in the drive line it must be a one-piece drive line equipped only with flex discs at each end.

If it is a one-piece drive line why does it have a center bearing?