#### Answer

See the explanation below.

#### Work Step by Step

Standard form of a horizontal parabola is $x=a(y-k)^2+h$ and
Standard form of a vertical parabola is $y=a(x-h)^2+k$
Standard form of a hyperbola is $\dfrac{x^2}{a^2}-\dfrac{y^2}{b^2}=1$
Use standard form of equation of circles; $(x-a)^2+(y-b)^2=r^2$
Here, $r$ defines radius and $(a,b)$ defines center.
Standard form of an ellipse is $\dfrac{x^2}{a^2}+\dfrac{y^2}{b^2}=1$
In comparison to all the above conic sections, we have noticed that a parabola only consists of a single squared variable at a one time either $x^2$ or ^y^2$.