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The differential equation of the family ...

The differential equation of the family of curves of `x^(2)+y^(2)-2ay=0` where a is arbitary constant, is

A

`(x^2-y^2)(dy)/(dx)=2xy`

B

`2(x^2+y^2)(dy)/(dx)=xy`

C

`2(x^2-y^2)(dy)/(dx)=xy`

D

`(x^2+y^2)(dy)/(dx)=2xy`

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The correct Answer is:
A
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