a$)$ Define the rules of Chomsky Normal Form $($CNF$)$ b$)$ Is the following grammar in CNF$?$ Why? Support your answer with at least one case. S$->$AB$|$BC $|$a A$->$BA$|$a B$->$CC$|$b C$->$AB$|$a a$)$ Define the rules of Chomsky Normal Form $($CNF$)$

b$)$ Is the following grammar in CNF$?$ Why? Support your answer with at

least one case.

$S>AB|BC|a$

$ABA|a$

$BC|b$

$CAB|a$