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8. What is the equation of the circle whose center is at (4,0) and the radius is 3?
A) x2 + y2 - 8x + 4y + 7 = 0
B) x2 + y2 + 8x - 4y - 7 = 0
C) x2 + y2 - 8x + 7 = 0
D) x2 + y2 - 8y + 7 = 0 ​