Answer : 2. "देशनोक "
Explanation :

1. Karni Mata is the family deity of Charan and Rathore of Bikaner.

He is also said to be the incarnation of Jogamaya, the goddess of rats and world mother.

2. Her temple is in Deshnoke Bikaner, the foundation of which was laid by Karni Mata herself. The original temple of Karni Mata was built by Raja Jai Singh.

3. The present grand form of this temple was given by Maharaja Surat Singh.

4. Mostly rats are found in this temple, hence the temple is also called the temple of rats.