Let $A$ and $B$ be two square matrices of order $3$ and $AB = O_{3}$, where $O_{3}$ denotes the null matrix of order $3$. Then,
- Amust be $A = O_{3}$ and $B = O_{3}$
- Bif $A \neq O_{3}$, then $B$ must be $O_{3}$
- Cif $A = O_{3}$, then $B$ must be $O_{3}$
- Dit is possible that $A \neq O_{3}$ and $B \neq O_{3}$
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