MCQOPTIONS
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				| 1. | 
                                    A region S is ____ , iff for any x1 and x2 in S, the straight line segment connecting x1 and x2 is also contained in S. | 
                            
| A. | concave | 
| B. | convex | 
| C. | self-intersecting | 
| D. | polygon with hole | 
| Answer» C. self-intersecting | |