Which of the following best describes the primary characteristics of grammar?

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To explain through rules the unlimited sentences within a languageTo clearly define which sentences are grammatically correctTo identify all and only the grammatically acceptable sentences in a languageAll of the above

Explanation

Grammar serves several key functions: it uses rules to generate an infinite number of sentences (A), clearly indicates which sentences are grammatically valid (B), and predicts exactly those sentences that are grammatically correct and excludes others (C). Therefore, all these properties collectively define the main features of grammar.