If two tangents drawn from a point $P$ to the parabola $y^{2}=16(x-3)$ are at right angles,then the locus of point $P$ is :
- A$x+3=0$
- B$x+1=0$
- C$x+2=0$
- D$x+4=0$
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MediumWBJEE 2014
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