Choose the correct alternatives (more than one may be correct) and write the corresponding letters only.
Let $r=1(1+0)^*, s=11^*0 \text{ and } t=1^*0 $ be three regular expressions. Which one of the following is true?
$L(s) \subseteq L(r)$ and $L(s) \subseteq L(t)$
$L(r) \subseteq L(s)$ and $L(s) \subseteq L(t)$
$L(s) \subseteq L(t)$ and $L(s) \subseteq L(r)$
$L(t) \subseteq L(s)$ and $L(s) \subseteq L(r)$
None of the above
Answer is A and C. To know the answer let us check all the options:
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