In a grammar, if the production S->λ where S is a non-terminal is existed, such production is called ______?

In formal grammar, a production rule of the form A (or A ), where A is a non-terminal symbol and (or ) represents the empty string, is known as a null production or epsilon production. This type of production indicates that the non-terminal A can derive the empty string. Let's look at the options: A. Null Production: This matches the definition of a production where a non-terminal derives the empty string. B. Unit Production: A unit production is of the form A B, where both A and B are non-terminals. C. Secondary Production: This is not a standard term in formal language theory. D. Sigma Production: This is not a standard term in formal language theory. Sigma () typically denotes the set of terminal symbols. Therefore, the production S is a null production. The final answer is A Drop the next question 📸