The correct answer is option 3 - Panini. Panini is the author of the grammatical work Ashtadhyayi. Ashtadhyayi is an ancient text in Sanskrit and is considered one of the foundational texts of Sanskrit grammar. It is a comprehensive and systematic treatise on the rules and structure of the Sanskrit language. Panini`s work is known for its precision and logical organization and is highly regarded by linguists and grammarians. The Ashtadhyayi consists of eight chapters (ashta means eight) and each chapter is further divided into sections. It is written in the form of aphorisms or sutras which are concise and pithy statements. Panini`s Ashtadhyayi has had a significant influence on the development of Sanskrit grammar and linguistic studies.