执行下列代码，输出结果是？（ ）
>import numpy as npx = [(0,1,2),(3,4,5),(6,7,8)]a = np.asarray(x)print (a)
[(0 1 2)(3 4 5)(6 7 8)]
[(0 1 2),(3 4 5),(6 7 8)]
[[0 1 2][3 4 5][6 7 8]]
[[0 1 2],[3 4 5],[6 7 8]]