Find f for the function f(x, y)= 3x'y-7y?. O a. f = 9x2-14y Ob.fy = 14x+9y Oc fy = 14x2-9y O d. fy = 24x2- 14y O e. fy = 9x2+14y %3D %3D %3D %3D

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A: