Niccolo de Conti, Abdur Razzaq, Afanasy Nikitin, and Fernao Nuniz were all travelers and explorers who visited various empires during their time. The correct answer in this case is option 2, the Vijayanagara empire.

The Vijayanagara empire was a prominent South Indian empire that flourished from the 14th to 17th centuries. It was known for its prosperous trade routes, rich culture, and architectural marvels. This empire attracted visitors and merchants from different parts of the world.

Niccolo de Conti, an Italian explorer, visited the Vijayanagara empire in the 15th century and documented his experiences in his travel accounts. He provided valuable insights into the empire`s political and cultural aspects.

Abdur Razzaq, a medieval Persian traveler, also visited the Vijayanagara empire during the 15th century. He wrote about the empire`s grandeur and the lifestyle of its rulers and citizens.

Afanasy Nikitin, a Russian merchant, visited the Vijayanagara empire in the early 16th century. He described the empire`s bustling markets, religious practices, and its position as a major trading center in his travelogue.

Fernao Nuniz, a Portuguese traveler, documented his