Consider the context$-$free grammar with the following production rules, and $S$ the start symbol.

Time left $1$:$08$:$28$

Then describe the language generated by the grammar.

$SCBCB$

$C$aCb$|ab|$

$B$

$SCBCB$

Select one or more:

$\{a^n{b}^n{a}^n{b}^n|n0\}$

All strings containing $1$ or more a followed by $1$ or more $b$

$\{a^n{b}^n{a}^n{b}^n|n1\}$

$\{a^n{b}^n{a}^m{b}^m|n,m0\}$

$\{a^n{b}^n{a}^m{b}^m|n,m1\}$

All strings containing at least the same number of $a\text{'}$s and b$\text{'}$s

All strings containing $a\text{'}$s and $b\text{'}$s