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Given vec a + vec b + vec c+ vec d= 0, w...

Given `vec a + vec b + vec c+ vec d= 0`, which of the following statements are correct:

A

`veca,vecb,vecc` and `vecd`must each be a null vector,

B

the magnitude of `(veca+vecc)`equal the magnitude of `(vecb+vecd)`,

C

the magnitude of `veca`can never be greater than the sum of magnitude of `vecb,vecc`and `vecd`

D

`vecb+vecc` must lie in the place of `veca` and `vecd` if `veca` and `vecd` are not collinear,and in the line of `veca` and `vecd`,if they are collinear.

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