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If a partial order is drawn as a Hasse diagram in which no two edges cross, its covering graph is called ______

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If a partial order is drawn as a Hasse diagram in which no two edges cross, its covering graph is called ______

(a) upward planar

(b) downward planar

(c) lattice

(d) biconnected components

I had been asked this question in quiz.

I need to ask this question from Graphs topic in section Graphs of Discrete Mathematics

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Best answer
Correct answer is (a) upward planar

To explain I would say: In a Hasse diagram if no two edges cross each other in the drawing of partial order Hasse diagram, then its covering graph called the upward planar.

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