Which of the following characteristic are necessary for a sequential circuit? It must have 6 gatesIt must have feedbackIts output should depend on past value Which of the above statements are correct?

Which of the following characteristic are necessary for a sequential c

1.	Which of the following characteristic are necessary for a sequential circuit? It must have 6 gatesIt must have feedbackIts output should depend on past value Which of the above statements are correct?
A.	1, 2, 3
B.	1, 2
C.	2, 3
D.	1, 3
Answer» D. 1, 3