Q13

MSQ1 mark

Let $L_1, L_2$ be two regular languages and $L_3$ a language which is not regular. Which of the following statements is/are always TRUE?

(A)

$L_1=L_2$ if and only if $L_1 \cap \overline{L_2}=\phi$

(B)

$L_1 \cup L_3$ is not regular

(C)

$\overline{L_3}$ is not regular

(D)

$\overline{L_1} \cup \overline{L_2}$ is regular

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