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ABCD is a parallelogram, with AC, BD as ...

ABCD is a parallelogram, with AC, BD as diagonals, then `overset(-)(AC)-overset(-)(BD)` is equal to

A

`4 overset(-)(AB)`

B

`overset(-)(AB)`

C

`3 overset(-)(AB)`

D

`2 overset(-)(AB)`

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The correct Answer is:
D
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