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Which among the following are incorrect regular identities?

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in Automata Theory by (51.1k points)
Which among the following are incorrect regular identities?

(a) εR=R

(b) ε*=ε

(c) Ф*=ε

(d) RФ=R

The question was posed to me in an interview for internship.

My question comes from Operators of Regular Expression in chapter Regular Expressions and Languages of Automata Theory

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The correct answer is (d) RФ=R

For explanation I would say: There are few identities over Regular Expressions which include: RФ=ФR=Ф≠R

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