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

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