A circle has its center at (1, 4) and a radius of 2 units. What is the equation of the circle?

(x − 1)2 + (y − 4)2 = 4
(x + 2)2 + (y + 4)2 = 2
(x + 1)2 + (y − 4)2 = 4
(x − 1)2 + (y − 4)2 = 2

Last one or something else?