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A Ring is said to be commutative if it also satisfies the property

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in Cryptograph & Network Security by (60.1k points)
A Ring is said to be commutative if it also satisfies the property

(a) R-vi

(b) R-v

(c) R-vii

(d) R-iv

I had been asked this question during an interview.

Origin of the question is Groups Rings and Fields topic in chapter Basic Concepts in Number Theory and Finite Fields of Cryptograph & Network Security

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Right choice is (d) R-iv

To explain I would say: A Ring is said to be commutative if it also satisfies the property R-iv: Commutativity of multiplication.

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