Which function is graphed?

A. Y = x^2 + 6, x < 3 / -x + 6, x ≥ 3

B. Y = x^2 + 6, x ≥ 3 / -x + 6, x < 3

C. Y = x^2 + 6, x ≤ 3 / -x + 6, x > 3

D. Y = x^2 + 6, x > 3 / -x + 6, x ≤ 3

And can someone explain why too, if that’s okay.