The output of a JK flip-flop with a synchronous pre-set and clear inputs is ‘1’. The output can be changed to ‘0’ with one of the following conditional by applying.
1
J = 0, K = 0 and using a clock
2
J = 1, K = 0 and using the clock
3
A synchronous pre-set input
4
J = 1, K = 1 and using the clock