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在C++中,关于二维数组的初始化,以下哪项正确?

Aint arr[2][3] = {{1,2,3}, {4,5,6}, {7,8,9}};
Bint arr[3][2] = {{1,2}, {3,4}};
Cint arr[2][3] = {1,2,3,4,5,6};
Dint arr[2][3] = {1,2,3,4,5,6,7};