Acircle in the standard (x, y) coordinate plane is tangent to the x-axis at 4 and tangent to the y-axis at 4. which of the following is an equation of the circle? a (x − 4)2 + (y − 4)2 = 16 b x2 + y2 = 16 c (x + 4)2 + (y + 4)2 = 16 d x2 + y2 = 4 e (x − 4)2 + (y − 4)2 = 4