The Speed of FM Waves Will Be Observed to Be

The speed of FM waves will be observed to be c = 2.9979 × 108 m/s when the antenna emitting the waves is

A) at rest relative to the receiving antenna.
B) moving to the right of the detecting antenna at 0.5c.
C) moving to the left of the detecting antenna at 0.5c.
D) moving as described in (a) , (b) or (c) above.
E) moving at 2.9979 × 108 m/s.