Engineering Mechanics
According to the law of moments, if a number of coplanar forces acting on a particle are in equilibrium, then

Their lines of action are at equal distances
Their algebraic sum is zero
The algebraic sum of their moments about any point in their plane is zero
The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point

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Engineering Mechanics
Non-coplanar non-concurrent forces are those forces which

None of these
Do not meet at one point but their lines of action lie on the same plane
Do not meet at one point and their lines of action do not lie on the same plane
Meet at one point, but their lines of action do not lie on the same plane

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