Cho\(A = \left\{ {1,2,3,4,5,6} \right\},B = \left\{ { - 2,0,3,5,9} \right\}\). Khi đó \(A \cup B = \)
A.\(\left\{ { - 2,0,1,2,3,4,5,6,9} \right\}\)                          
B.\(\left\{ { - 2,0,9} \right\}\) 
C.\(\left\{ {3,5} \right\}\)                                                  
D. \(\left\{ {1,2,4,6} \right\}\)

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