Q$5$

Choose the appropriate regular expression for the following grammar:

$Sa{Q}_0|b{Q}_0||$

$Q_{0}c{Q}_0|Q_1||$

$Q_{1}a{Q}_1|b{Q}_2|$

$Q_{2}c{Q}_2|||$

$$ No such regular expression exists; this is not an $5-$grammar.

$(a+b)c^{**}{a}^{**}(+b{c}^{**})$

$(a+b)(c^{**}+(a^{**}+b))c^{**}$

$ab{c}^{**}(a+b)c^{+}$