Answer : 4. "एक विद्वान जिसने संस्कृत भाषा का व्याकरण तैयार किया"
Explanation :

Panini was a Sanskrit grammarian who gave a comprehensive and scientific theory of phonetics, phonology, and morphology. Sanskrit was the classical literary language of the Indian Hindus and Panini is considered the founder of the language and literature.