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Given $\vec{a} + \vec{b} + \vec{c} + \vec{d} = 0$ , which one of the following is incorrect?

1.	a→ , b → , c → and d → must be null vectors.
2.	The magnitude of a → + c → equals the magnitude of b → + d → .
3.	The magnitude of a → can never be greater than the sum of the magnitudes of b → , c → and d →
4.	b → + c → must lie in the plane of a → and d → if a → and d → are not collinear, and along the direction of a → and d → if they are collinear.

Subtopic: Resultant of Vectors |

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A scalar quantity is one that:

1.	is conserved in a process.
2.	will never accept negative values.
3.	must be dimensionless.
4.	has the same value for observers with different orientations of axes.