A circle in the standard (x, y) coordinate plane is tangent to the x-axis at 4 and

Question:

A circle 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. x²+ y²= 4
B. x²+ y²= 16
C. (x − 4)²+ (y − 4)²= 4
D. (x − 4)²+ (y − 4)²= 16
E. (x + 4)²+ (y + 4)²= 16