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Which description best describes upfade in a multipath environment?

Which description best describes upfade in a multipath environment?
A . In this situation, multiple signal paths are not sent at exactly the same time. The receiver receives a positive crest on the primary signal and a negative crest on the secondary signal.
B . In this situation, the multiple signal paths are distorted and difficult to understand.
C . In this situation, the multiple signal paths are weaker than they should be because the signals are out of phase with each other.
D . In this situation, the signal is stronger than it should be because multiple signal paths are received twice at exactly the same time, which results in the multiple signals being in-phase.

Answer: D

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