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Let A and B be two square matrices of or...

Let A and B be two square matrices of order 3 and `AB=O_3`, wher `O_3` denotes the null matrix of order 3. Then,

A

must be `A=O_3,B=O_3`

B

If `AneO_3`,must be `BneO_3`

C

If `A=O_3`,must be `BneO_3`

D

may be `A=neO_3,B=O_3`

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The correct Answer is:
D
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