While there is (are) only _____ way(s) to send parallel data, there is (are) three subclass(es) of serial transmission.

While there is (are) only _____ way(s) to send parallel data, there is

1.	While there is (are) only _____ way(s) to send parallel data, there is (are) three subclass(es) of serial transmission.
A.	one; two
B.	two; three
C.	one; three
D.	none of the above
Answer» D. none of the above