Three vectors A,B and C add up to zero. Find which is false.

Options :

1. (A×B) × C is not zero unless B,C are parallel.

2. (A×B).C is not zero unless B,C are parallel

3. If A,B,C define a plane, (A×B)×C is in that plane

4. (A×B).C=|A| |B| |C|→ C²=A²+B²