we have
this is the equation of a vertical parabola open upward
Convert into vertex form
The vertex is the point ----> is a minimum
The range of the function is the interval--------> [-8,∞)
that means------> all real numbers greater than or equal to
The domain of the function is the interval-----> (-∞,∞)
that means------> all real numbers
therefore
the answer is the option
All real numbers
see the attached figure to better understand the problem