Let {:A=[(1,2),(3,4)]and BA=[(a,0),(0,b)...

Let `{:A=[(1,2),(3,4)]and BA=[(a,0),(0,b)]:},a,b in N` Then,

A

There cannot exist any B such that AB = BA

B

There exists more than one but finite number of B's such that AB = BA

C

There exists exactly one B such that AB = BA

D

There exists infinitely many B's such that AB = BA

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The correct Answer is:

D

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