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A square ABCD of diagonal length 2a, is ...

A square ABCD of diagonal length 2a, is folded along the diagonal AC so that the planes DAC, BAC are at right angles. The shortest distance between DC and AB is

A

`(a)/(sqrt(3))`

B

`(2a)/(sqrt(3))`

C

`sqrt(3)a`

D

none of these

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The correct Answer is:
B
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