Answer : 4. "ताबो"
Explanation :

It was founded in 996 CE in the Tibetan year of the Fire Ape by the Tibetan Buddhist lotsawa (translator) Rinchen Zangpo (Mahauru Ramabhadra), on behalf of the king of the western Himalayan Kingdom of Guge, Yeshe-Ö. Tabo is noted for being the oldest continuously operating Buddhist enclave in both India and the Himalayas.