A circle has a diameter with endpoints (-10, -6) and (-2, -4).

What is the equation of the circle?

r2 = (x + 4)2 + (y + 5)2
r2 = (x + 6)2 + (y + 5)2
r2 = (x + 4)2 + (y + 1)2
r2 = (x + 6)2 + (y - 1)2