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49. The rise time (tr) is the time it takes for a pulse to rise from its ________ point up to its ________ point. The fall time (tf) is the length of time it takes to fall from the ________ to the ________ point.
(a) 10%, 90%, 90%, 10%
(b) 90%, 10%, 10%, 90%
(c) 20%, 80%, 80%, 20%
(d) 10%, 70.7%, 70.7%, 10%
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