If (x(1), y(1)) and (x(2), y(2)) are the...

If `(x_(1), y_(1))` and `(x_(2), y_(2))` are the ends of the focal chord of `y^(2)=4 a x` then `x_(1) x_(2)+y_(1) y_(2)=`

A

`-3 a^(2)`

B

`3 a^(2)`

C

`-4 a^(2)`

D

`4 a^(2)`

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A

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