Write the two statements that form the biconditional.
A polygon is a triangle if and only if it has exactly three sides.
What are the two conditional statements that form this biconditional? Select the two that apply.
A. A polygon has exactly three sides.
B. If a polygon is a triangle, then it has exactly three sides.
C. If a polygon has exactly three sides, then it is a triangle.
D. A polygon has exactly three sides if and only if it is a triangle.
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E. A polygon is a triangle if and only if it has exactly three sides.
F. A polygon is a triangle.