If the tangent to the parabola $y^2 = ax$ makes an angle of $45^{\circ}$ with the $x$-axis,what is its point of contact?
- A$\left( \frac{a}{4}, \frac{a}{2} \right)$
- B$\left( \frac{a}{2}, \frac{a}{2} \right)$
- C$\left( -\frac{a}{2}, \frac{a}{4} \right)$
- D$\left( -\frac{a}{4}, \frac{a}{2} \right)$
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