Rectangle Line Equation

The points $C(-2,0)$ and $D(2,0)$ lie on the x-axis, so the length of side $CD = 2 - (-2) = 4$. Since area of rectangle = $\text{length} \times \text{breadth} = 24$, the side $AD = BC = \frac{24}{4} = 6$. Since $CD$ lies on the horizontal line $y=0$, the side $AB$ must be parallel to $CD$ at a vertical distance of 6 units. Thus, the equation of the line $\overline{AB}$ can be $y = 6$ or $y = -6$. Among the choices, $y = 6$ is given.