Question $9$

Consider the language $L$ defined by the following grammar with productions

;$>AB$

$A|Ab$

$Bb|Ba$

Which of the following statements are true for all sentences of $L?$

All as precede all b$\text{'}$s$.$

Each sentence contains exactly as many a$\text{'}$s as b$\text{'}$s$.$

Each sentence contains one or more b$\text{'}$s$.$

Each sentence contains one or more a$\text{'}$s$.$

Each sentence contains at least two letters.