If \(A = \,\left[ {\begin{array}{*{20}{c}} 1&0\\ 2&0 \end{array}} \right]\),\(B = \left[ {\begin{array}{*{20}{c}} 0&0\\ 1&{12} \end{array}} \right]\), then 

1
AB = 0, BA = 0
2
AB = 0, BA ≠ 0
3
AB ≠ 0, BA = 0
4
AB ≠ 0, BA ≠ 0

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