What statement about the beamwidth of an RF antenna is true?

A. Horizontal and vertical beamwidth are calculated at the point where the main lobe decreases power by 3 dB.

B. Vertical beamwidth is displayed (in degrees) on the antenna-s Azimuth chart.

C. When antenna gain is lower, the beamwidth is also lower in both the horizontal and vertical dimensions.

D. The beamwidth patterns on an antenna polar chart indicate the point at which the RF signal stops propagating.