Find the potential function f for the field F. F = (y - z) i + (x + 2y - z) j - (x + y) k   a) f(x, y, z) = x(y + y2) - xz - yz + C   b) f(x, y, z) = xy + y2 - x - y + C   c) f(x, y, z) = xy + y2 - xz - yz + C   d) f(x, y, z) = x + y2 - xz - yz + C

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