Q 1453180944.     Two perpendicular tangents `PA` and `PB` are drawn to `y^2 = 4ax`, minimum length of `AB` is equal to

A

`a`

B

`4a`

C

`8a`

D

`2a`

HINT

Chord of contact of mutually perpendicular tangents is always a focal chord. Therefore minimum length of `AB` is `4a`.
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