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if the coordinates of the mid points of the Sides of a triangle are `(1,2) ,(0,-1)` and `(2, -1)`.Find the coordinates of its vertices `:

A

`(1,-4),(3,2),(-1,2)`

B

`(1,2),(2,3),(3,-4)`

C

`(3,4),(5,2),(1,2)`

D

None of these

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