Line segment joining the mid-points \( M \) and \( N \) of parallel sides \( A B \) and \( D C \...

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Line segment joining the mid-points \( M \) and \( N \) of parallel sides \( A B \) and \( D C \), respectively of a trapezium \( A B C D \) is perpendicular to both the sides \( A B \) and \( D C \). Then
(a) \( A D=B C \)
(b) \( A D=2 B C \)
(c) \( A D \| B C \)
(d) \( A DB C \)
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