Answer : 3. "1676 ई"
Explanation :

1. Raj Prashasti is a Sanskrit poem and inscription composed to commemorate the construction of Rajsamand Lake by Maharana Raj Singh in 1676.

2. Prashasti Kavya was written by Ranchod Bhatt Tailang on the orders of his patron Raj Singh.

3. In 1687, by the order of Maharana Jai Singh, this praise was inscribed on stone tablets.