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

B

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

C

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

D

`(d^2v)/(dr^2)-1/r*(dv)/(dr)=0`.

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