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Which of the following CFG is a regular grammar? a. S->AB | null; A->aA; B->bB b. S->Ab | null; B->b; A->aB c. S->aaA | a;

Which of the following CFG is a regular grammar?

a. S->AB | null; A->aA; B->bB

b. S->Ab | null; B->b; A->aB

c. S->aaA | a; A->null; B->AS

d. S->bbA | null; B->b; A->aB

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