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Let R1 and R2 be regular sets defined over alphabet ∑ then?

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Let R1 and R2 be regular sets defined over alphabet ∑ then?

(a) R1 UNION R2 is regular

(b) R1 INTERSECTION R2 is regular

(c) ∑ INTERSECTION R2 IS NOT REGULAR

(d) R2* IS NOT REGULAR

I got this question in semester exam.

The question is from Regular Grammar in section Contextfree Grammar and Syntax Analysis of Compiler

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Right option is (a) R1 UNION R2 is regular

The explanation is: Union of 2 regular languages is regular.

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