The correct answer is option 2, Rajendra I. Rajendra I was the first king of the Chola dynasty to conquer Sri Lanka. He ruled from 1014 AD to 1044 AD and was known for his military prowess and expansionary campaigns. Under his leadership, the Chola Empire reached its zenith, extending its influence and control over vast regions in South India, Sri Lanka, Southeast Asia, and the Indian Ocean. Rajendra I`s conquest of Sri Lanka further solidified the Chola Empire`s power and established a strong presence in the island nation. His victory over Sri Lanka not only demonstrated the Cholas` military might but also showcased their naval dominance in the region. Overall, Rajendra I`s conquests played a significant role in shaping the Chola dynasty`s legacy as a major political and military force in medieval South India.