ABCD is a rectangle having length (x+1) and breadth (x−1) . If P, Q, R and S are the mid-points of side AB, BC, CD and DA respectively, then the perimeter of the quadrilateral PQRS is
A
√4a(x2−1)x
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B
√4a(x2−1)2
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C
2√4x2+1
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D
2√2(x2+1)
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