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

What statement about the beamwidth of an RF antenna is true?
A . Horizontal and vertical beamwidth are calculated at the points where the main lobe decreases power by 3 d
C . The beamwidth patterns on an antenna polar chart indicate the point at which the RF signal stops propagating.
D . When antenna gain is lower, the beamwidth is also lower in both the horizontal and vertical dimensions.
E . Vertical beamwidth is displayed (in degrees) on the antenna’s Azimuth chart.

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Answer: A