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If b a r r ⋅ = 1, c b r r ⋅ = 2 and a c r r ⋅ = 3, then the value of [ ] ) a b ( c ), a c ( b ), c b ( a r r r r r r r r r × × × × × × is

1. 0
2. ) c b ( a 6 r r r × ⋅ −
3. ) b a ( c 12 r r r × ⋅
4. ) a c ( b 12 r r r × ⋅ −

Correct answer: 0

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