As shown in the figure, a point-to-point communication link with a length of 10km, a tree with an obstacle height of 12.2m in the link, and a distance between the tree and one of the antennas is 4km, calculate the radius of Fresnel zone at 4km, if the signal transmission frequency is 5.8GHz, refer to the following formula according to the actual situation, what is the minimum installation height of the transmit and receive antenna from the ground?

As shown in the figure, a point-to-point communication link with a length of 10km, a tree with an obstacle height of 12.2m in the link, and a distance between the tree and one of the antennas is 4km, calculate the radius of Fresnel zone at 4km, if the signal transmission frequency is 5.8GHz, refer to the following formula according to the actual situation, what is the minimum installation height of the transmit and receive antenna from the ground?

A . 16
B . 19
C . 22
D . 26

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Answer: B