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53. Which statement BEST describes the operation of a negative-edge-triggered D flip-flop?
(a) The logic level at the D input is transferred to Q on NGT of CLK.
(b) The Q output is ALWAYS identical to the CLK input if the D input is HIGH.
(c) The Q output is ALWAYS identical to the D input when CLK = PGT.
(d) The Q output is ALWAYS identical to the D input.
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