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Let A=((1 , 2), (3, 4)) andB=((a , 0), ...

Let `A=((1 , 2), (3, 4)) andB=((a , 0), (0 , b)), a , b in N` Then,
(a) there exist exactly one `B` such that `AB=BA`
(b) there exist exactly infinitely many B's such that AB=BA
(c) there cannot exist any `B` such that `AB=BA`
(d) there exist more than one but finite number of B's such that `AB=BA`

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