The symbol for a flip flop has a small triangle

Question

The symbol for a flip flop has a small triangle - and no bubble - on its clock (CLK) input. The triangle indicates:
A) the FF is level active and can only change states when the CLOCK = 1.
B) the FF is edge- triggered and can only change states when the clock goes 0 to 1.
C) the FF is an active LOW device and can only change states when the CLOCK = 0.
D) the FF is edge- triggered and can only change states when the clock goes from 1 to 0.

Quizplus · Accepted Answer

The small triangle on the clock input of a flip-flop symbol indicates that the flip-flop is edge-triggered, specifically that it can only change states on a rising edge, when the clock signal transitions from 0 to 1.