 
			 
			MCQOPTIONS
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				| 1. | 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» B. downward planar | |