Please answer these short questions

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What is the language corresponding to the following DFA? L(M)={aawbbw{a,b}}L(M)={aw1aaw2aw1{a,b},w2{a,b}}L(M)={bw1abaaw2bw1{a,b},w2{a,b}}L(M)={awabawaw{a,b}}L(M)={awaawaw{a,b}} Assume A and B are regular languages. Which one is not necessarily a regular language? ABABA\B All choices are regular