The channels of SWYAM PRABHA are uplinked from BISAG,

The correct option is Gandhinagar.

Step-by-step Explanation:
1. Understanding SWAYAM PRABHA: SWAYAM PRABHA is an initiative of the Ministry of Education, Government of India. It consists of a group of DTH (Direct-to-Home) channels dedicated to broadcasting high-quality educational programming 24 hours a day, 7 days a week, covering diverse disciplines.
2. Satellite and Uplinking: The educational content is telecast using the GSAT-15 satellite. To broadcast these signals, the content must be uplinked to the satellite from a ground-based earth station.
3. Role of BISAG: The Bhaskaracharya National Institute for Space Applications and Geo-informatics (BISAG-N) is the state-of-the-art nodal agency responsible for facilitating this uplinking services.
4. Location: BISAG-N is located in Gandhinagar, Gujarat. Therefore, the DTH channels of SWAYAM PRABHA are uplinked from BISAG, Gandhinagar.