In synchronous systems, the exact times at which any output can change state are determined by a signal commonly called the ________.

In synchronous systems, the exact times at which any output can change

1.	In synchronous systems, the exact times at which any output can change state are determined by a signal commonly called the ________.
A.	traffic
B.	D
C.	flip-flop
D.	clock
Answer» E.