If you prove that △ABD is congruent to △CDB, which general statement best describes what you have proved?
Given: Opposite Sides Of Quadrilateral ABCD Are Parallel
A: Opposite sides of a parallelogram are congruent
B: The diagonal of a parallelogram connects two non-consecutive vertices
C: Diagonals of a parallelogram are congruent
D: Diagonals of a parallelogram bisect each other
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