In a project, the two sites are 3km apart , but there is an 18m high building in the middle of the two points, and there are no higher obstacles in other locations. When using 5G backhaul, how many meters should the installation height of the two sites be at least?

In a project, the two sites are 3km apart , but there is an 18m high building in the middle of the two points, and there are no higher obstacles in other locations. When using 5G backhaul, how many meters should the installation height of the two sites be at least?
A . 20
B . 25
C . 30
D . 35

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Answer: B