Equation of the circle with AB as its diameter is

A

$$x^2 + y^2 - 12x + 24 = 0$$

B

$$x^2 + y^2 + 12x + 24 = 0$$

C

$$x^2 + y^2 + 24x - 12 = 0$$

D

$$x^2 + y^2 - 24x - 12 = 0$$