Mark the correct alternative in each of the following: The distance between the orthocentre and ...

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Mark the correct alternative in each of the following:
The distance between the orthocentre and circumcentre of the triangle with vertices \( (1,2) .(2,1) \) and \( \left(\frac{3+\sqrt{3}}{2}, \frac{3+\sqrt{3}}{2}\right) \) is
(A) \( \sqrt{2} \)
(B) \( 3+\sqrt{3} \)
(C) none of these
(D) undefined
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