What is the contrapositive of the following statement?

**"If a polygon has 3 sides, then the polygon is a triangle."**
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a) lf a polygon does not have 3 sides, then the polygon is not a triangle.
b) If a polygon is a triangle, then the polygon has 3 sides.
c) lf a polygon is not a triangle, then the polygon does not have 3 sides.
d) The polygon has 3 sides if and only if the polygon is a triangle.