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The axis of a parabola is along the line...

The axis of a parabola is along the line y=x and the distance of its vertex from origin is `sqrt2` and that from its focus is `2sqrt2` . IF vertex and focus both lie in the first quadrant, the equation of the parabola is

A

`(x + y)^2 =(x-y- 2)`

B

`(x -y)^2 =(x+y- 2)`

C

`(x -y)^2 =4 (x + y- 2)

D

`(x -y)^2 =8 (x+ y- 2)`.

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