The circle below is centered at the point (2.-1) and has a radius of length 3.
what is its equation?
a. (x+1)2 + (y-2)2 = 9
b. (x-2)2 + (x + 1)2 =
32
c. (x-1)2 + (y + 2)2 = 9
d. (x + 2)2 + (x-1)2 =

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