In the WLAN outdoor long-distance point-to-point communication, if a stable communication link is to be maintained, what percentage of the first Fresnel area generally cannot be blocked?

In the WLAN outdoor long-distance point-to-point communication, if a stable communication link is to be maintained, what percentage of the first Fresnel area generally cannot be blocked?
A . 0.2
B. 0.4
C. 0.5
D. 0.6

Answer: B

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