Explanation:

• The Sambhar Salt Lake is India’s largest inland salt lake. The lake receives water from five rivers Medtha, Samaod, Mantha, Rupangarh, Khari and Khandela. The lake is an extensive saline wetland. It is the source of most of Rajasthan’s salt production.
• Sambhar has been designated as a Ramsar site (recognized wetland of international importance) because the wetland is a key wintering area for tens of thousands of pink flamingos and other birds that migrate from northern Asia and siberia.

Hence option 3rd is correct.