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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)`, where `O_(3)` denotes the null matrix of order 3. Then

A

must be `A = O_(3), B = O_(3)`

B

if `A ne O_(3)`, must be `B ne O_(3)`

C

if `A = O_(3)`, must be `B ne O_(3)`

D

may be `A ne O_(3), B ne O_(3)`

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