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單項選擇題

Refer to the exhibit. The signal transmitted from the AP is reflected off a wall resulting in multipath  interference at the client end. 
Which statement is true? ()

A. The transmitted signal from the AP arrives at the client at slightly different times resulting in  phase shifting.
B. If signal 2 is close to 360 degrees out of phase with signal 1, the result is essentially zerosignal  or a dead spot in the WLAN.
C. Multipath interference is less of an issue when using a DSSS technology because multipath is  frequency selective.
D. If signal 1 is in phase with signal 2, the result is essentially zerosignal or a dead spot in the  WLAN.
E. Multipath interference is solved by using dual antennas.

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