Consider the following:

1. The Nagara style of temple architecture generally follows the Panchayatan style of temple making.

2. One of the striking features of  Dravidian temples is that they are surrounded by high boundary walls.

3. Vesara style combines features of both the Nagara school and Dravidian school and results in a hybridized style.

4. One of the distinctive features of Hoysala architecture is the star-shaped ground plan of many of their temples. 

How many of the above statements is/are correct?