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If the segment intercepted by the parabola `y=4a x` with the line `l x+m y+n=0` subtends a right angle at the vertex, then `4a l+n=0` (b) `4a l+4a m+n=0` `4a m+n=0` (d) `a l+n=0`

A

`4al + n = 0`

B

`4a l + 4am + n = 0`

C

`4am + n = 0`

D

`al + n = 0`

Text Solution

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The correct Answer is:
A
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