What is the equation of a circle with a center at (-5,-1) and radius of 6 units?

(x + 5)2 + (y + 1)2 = 6
(x + 5)2 + (y + 1)2 = 36
(x - 5)2 + (y - 1)2 = 36
(x - 5)2 + (y - 1)2 = 6