The equation of the sphere with radius r = V75 and center C(2,1, – 1) is (a) x² + y² + z² + 4x + 2y – 2z – 69 = 0. (b) x² + y? + z² – 4x – 2y + 2z – 69 = 0. (c) x2 + y2 + z2 + 4x + 2y – 2z + 69 = 0. (d) x? + y2 + z2+ 4x + 2y – 2z + 69 = 0. %3D

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