Which statement describes the effect on the parabola y = x? - 1 when it is changed to y = x2 + 6?
A. The parabola is translated up by 7 units.
B. The parabola is translated down by 7 units.
C. The parabola is translated to the left by 7 units.
• D. The parabola is translated to the right by 7 units.