Answer : 2. "26 नवंबर"
Explanation :

1. On November 26, 1949, the Constituent Assembly adopted the Indian Constitution. However, it was implemented throughout the country from January 26, 1950.

2. Since 2015, the Government of India has declared 26 November as Constitution Day. The objective of this decision is to promote the importance of the Constitution and educate citizens about their rights and duties.