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【单选题】
设A和B分别为4×3的和3×5的矩阵,且AB=O(零矩阵),其中B为非零矩阵,下列结论中一定正确的是A.
B的列向量均为齐次线性方程组Ax=0的解。
B.
B的行向量均为齐次线性方程组Ax=0的解。
C.
A的秩r(A)=3
D.
A的秩r(A)=1
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