The distance between the pair of parllel...

The distance between the pair of parllel lines `x ^(2) + 4xy + 4y ^(2) + 3x + 6y - 4=0` is :

A

`sqrt5`

B

`(2)/(sqrt5)`

C

`(1)/(sqrt5)`

D

`(sqrt5)/(2)`

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The correct Answer is:

A

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