Q. Which of the following describes the operation of a positive edge-triggered D flip-flop?

• (A) if both inputs are high, the output will toggle
• (B) the output will follow the input on the leading edge of the clock
• (C) when both inputs are low, an invalid state exists
• (D) the input is toggled into the flip-flop on the leading edge of the clock and is passed to the output on the trailing edge of the clock