If the tangents of the parabola $y^2=8 x$ passing through the point $P(1,3)$ touches the parabola at $A$ and $B$, then the area (in sq. units) of $\triangle A B C$ is

• A

  $1$
• B

  $\frac{3}{4}$
• C

  $\frac{1}{2}$
• Correct answer
  D

  $\frac{1}{4}$

Hence, the correct answer is option: 'D'.