With reference to ancient Indian History, consider the following pairs : Literary work - Author 1. Devichandragupta - Bilhana 2. Hammira-Mahakavya - Nayachandra Suri 3. Milinda-panha - Nagarjuna 4. Nitivakyamrita - Somadeva Suri How many of the above pairs are correctly matched?

1. Pair 1: Devichandragupta is a Sanskrit play attributed to Vishakhadatta. Bilhana was the author of Vikramankadevacharita. Thus, this pair is incorrectly matched. 2. Pair 2: Hammira-Mahakavya is indeed authored by the Jain scholar Nayachandra Suri. It details the history of the Chauhan king Hammiradeva. Thus, this pair is correctly matched. 3. Pair 3: Milinda-panha (Questions of King Milinda) is a Buddhist text recording a dialogue between the Indo-Greek king Menander I (Milinda) and the sage Nagasena. It is not attributed to the Mahayana philosopher Nagarjuna. Thus, this pair is incorrectly matched. 4. Pair 4: Nitivakyamrita, a work on statecraft and ethics based on Jain principles, was authored by Somadeva Suri, a Jain monk of the 10th century. Thus, this pair is correctly matched. 5. Therefore, only two pairs (2 and 4) are correctly matched.