The differential equation of the family ...

The differential equation of the family of curves `v=(A)/( r)+B` where A and B are arbitrary constants is

A

`(d^(2)v)/(dr^(2))+(1)/(r )(dv)/(dr)=0`

B

`(d^(2)v)/(dr^(2))-(2)/(r )(dv)/(dr)=0`

C

`(d^(2)v)/(dr^(2))+(2)/(r )(dv)/(dr)=0`

D

`(d^(2)v)/(dr^(2))-(2)/(y) (dy)/(dr)=0`

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