Ha, this question is a real head-scratcher! I'm going to go with B, C, and D. Gotta love those electromagnetic waves and their sneaky polarization tricks.
Hmm, this is a tricky one. I'm going with B, C, and D. The electric field direction is key for polarization, and the circular polarization part is logical.
I think A, B, and D are the right answers. The antenna radiates the waves, the polarization is about the magnetic field, and the circular polarization requirement makes sense.
I'm sure the correct answer is B, C, and D. The polarization of the antenna refers to the direction of the electric field, and the electric field changes according to a certain rule. Plus, circular polarization requires the transmitting and receiving antennas to have the same polarization direction.
Marci
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