what is the correct answer?

Using the following equation, find the center and radius: x2 - Ax + y2 + 8y = -4 (5 points) O OO O The center is located at (-2, -4), and the radius is 4. The center is located at (2, -4), and the radius is 4. The center is located at (-2, -4), and the radius is 16. The center is located at (2, -4), and the radius is 16