Which of the following statements as$/$are cortect?

$1$ The language $L$ accepts all the strings of $a\text{'}$s and $5\text{'}$s where the third symbol from left end is$)b.$ The regular expression for $L$ is $(a+b{)}^{2}b(a+b{)}^4$

II$.$ The lenguage $L$ accepts all the strings of a$\text{'}$s and b$\text{'}$s where the number of a$\text{'}$s in a string is divisible by $3.$ The regulat expression for $L$ is $\{$:$b^{**}a{b}^{**}ab\text{'}ab)$

III. The regular expression $R+(a+b{)}^{**}.$ The number of states required to construct the minimal DFA for the regular expression $R$ is $n+2$

Ait are correct

I AND II

II AND III

I AND III