The center of a circle is located at c(-7,-4). the y-axis is tangent to the circle at (0,-4). find the equation of the circle.
a. x^2+y=49
b. (x - 7)^2 + (y-4)^2=49
c. x^2+(y+4)^2=16
d. (x+7)^2+(y+4)^2=49

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