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The vertex of a parabola is the point (a...

The vertex of a parabola is the point (a,b) and latus rectum is of length I. If the axis of the parabola is along the positive direction of y-axis, then its equation is

A

`(x+ a)^(2)= (l)/(2) (2y- 2b)`

B

`(x- a)^(2)= (l)/(2) (2y- 2b)`

C

`(x+ a)^(2) = (l)/(4) (2y- 2b)`

D

`(x- a)^(2)= (l)/(8) (2y- 2b)`

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The correct Answer is:
B
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