Which of the following grammar rules violate the requirements of an operator…

GATE · 2004 · CS

Which of the following grammar rules violate the requirements of an operator grammar ? P, Q, R are nonterminals, and r, s, t are terminals.

1.    P → Q R                    
2.    P → Q s R
3.    P → ε       
4.    P → Q t R r

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Correct answer: B

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