Given ` vec A + vec B+ vec C + vec D =0`, which of the following statements are correct ?
(a) ` vec A, vec B ,vec C ` abd ` vec D` each must be a null vector.
(b) The magnitude of ` ( vec A + vec C)` equals the magnitude of ` ( vec B + vec D)`.
(c ) The magnitude of ` vec A` can never be greater than the sum of the magnitude of ` vec B , vec C ` and `vec D`.
( d) ` vec B + vec C` must lie in the plane of ` vec A + vec D`. if `vec A` and `vec D` are not collinear and in the line of ` vec A` and `vec D`, if they are collinear.

Answer

All statements except (a) - are correct