The domain of a function refers to all the possible input values (x-values) for which the function is defined.
In this case, the parabola has its vertex at (0, 4) and intercepts the x-axis at (-2, 0) and (2, 0). Since the parabola opens downward (as it has a maximum vertex), it will take values for x from -2 to 2 where it intersects the x-axis.
Thus, the domain of the function, based on the x-intercepts, is:
A. -2 ≤ x ≤ 2
This means the domain includes all x-values from -2 to 2, inclusive.