Find an equation of the surface of revolution by revolving the plane curve 3y = √(9- [(x-1)] ^2) about the x-axis. O [(x+1)]^2/9 +y^2+ z^2 = 1 O [(x-1)]^2/9 +y^2+ z^2 = 1 O [(x-1)] ^2 /4 +y^2+ z^2 = 1 O none of the above

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