If an 802.11 RF transmission reaches a receiving antenna simultaneously by direct and reflected paths, what effect will the reflected signal have on the signal that took the direct line-of-sight path?

If an 802.11 RF transmission reaches a receiving antenna simultaneously by direct and reflected paths, what effect will the reflected signal have on the signal that took the direct line-of-sight path?
A . The direct signal will only be received if the reflected signal is more than 180 degrees out of phase.
B . The direct signal cannot be received if the indirect signal is less than 90 degrees out-of-phase.
C . The signals will be distorted if the indirect signal arrives simultaneously at the receiver, but 90 degrees out-of-phase.
D . If the signals are in-phase, they will combine together, cancel one another out, and create a null.

Answer: C