Crey | If A is matrix of order m × n and B is a matrix such that AB’ and B’A are both defined, then order of matrix B is m × m, n × n, n × m, m × n

Question

If A is matrix of order m × n and B is a matrix such that AB’ and B’A are both defined, then order of matrix B is

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m × m
n × n
n × m
m × n

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