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?