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Flip-Flops - Technical MCQs

Q1:

As a general rule for stable flip-flop triggering, the clock pulse rise and fall times must be:

A very long.

B very short.

C at a maximum value to enable the input control signals to stabilize.

D of no consequence as long as the levels are within the determinate range of value.

ANS:B - very short.

As there is a term of "propagation delay" related to flip flop which affects on the output of flip-flop, and if this rising and falling time is less. There is some possibilities of decreasing the propagation delay. That's why I think short time must be the correct answer.