Each side of a given polygon is parallel to either the X or the Y axis. A corner

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Each side of a given polygon is parallel to either the X or the Y axis. A corner of such a polygon is said to be convex if the internal angle is 90° or concave if the internal angle is 270°.p>If the number of convex corners in such a polygon is 25, the number of concave corners must be

A. 20
B. 0
C. 21
D. 22

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