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Focus and directrix of the parabola x ^(...

Focus and directrix of the parabola `x ^(2) =-8ay` are

A

`(0, -1a ) and y=2a`

B

`(0, 2a ) and y =- 2a`

C

`(2a, 0) and x =- 2a`

D

`(-2a, 0) and x =2a`

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The correct Answer is:
A
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