Answer : 4. "बीकानेर "
Explanation :

1. Sadashiv Bhatt's book on cookery 'Rai Vinod' is related to Rajasthan. This text was written in Bikaner in the 16th century.

2. The book 'Rai Vinod' is an important part of Rajasthani culture. This text is an important source of information about Rajasthani cuisine and food culture.