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60. Propagation delay is important because ________.
(a) the logic gates must be given a short break during each clock cycle or else they will overheat
(b) it limits the maximum operating frequency of a gate
(c) it is a measure of how long the clock must be applied to the gate before it will make the required decision
(d) all the gates in a system must have the same propagation times in order to be compatible
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