The line among the following that touche...

The line among the following that touches the parabola `y^(2)=4ax ` is

A

`x+my+am^(3)=0`

B

`x-my+am^(2)=0`

C

`x+my-am^(2)=0`

D

`y+mx+am^(2)=0`

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The correct Answer is:

B

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