Three vectors \(A,B\) and \(C\) add up to zero. Then:
1. vector \((A\times B)\times C\) is not zero unless vectors \(B\) and \(C\) are parallel.
2. vector \((A\times B).C\) is not zero unless vectors \(B\) and \(C\) are parallel.
3. if vectors \(A,B\) and \(C\) define a plane, \((A\times B)\times C\) is in that plane.
4. \((A\times B). C= |A||B||C|\rightarrow C^2= A^2+B^2\)

The incorrect statement/s is/are:
1. (b), (d)
2. (a), (c)
3. (b), (c), (d)
4. (a), (b)