How does a high-gain omni-directional antenna compare to a typical omni-directional antenna?

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How does a high-gain omni-directional antenna compare to a typical omni-directional antenna?
A . it provides more multi-user spatial streams.
B . it provides more coverage in the horizontal direction than in the vertical direction.
C . it provides more single-user spatial streams.
D . it provides more coverage in both the horizontal and vertical directions.

Answer: B