If one end of a focal chord $\mathrm{AB}$ of the parabola $y^{2}=8 x$ is at $A\left(\frac{1}{2},-2\right)$, then the equation of the tangent to it at B is :
$2 x+y-24=0$
$x-2 y+8=0$
$2 x-y-24=0$
$x+2 y+8=0$
Correct Option: , 2
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