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
Answer:A
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
Explanation: 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.