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Option 1 states that The National Mangrove Genetic Resources Centre has been set up in Orissa. This statement is correct. National Mangrove Genetic Resources Centre has indeed been set up in Orissa to conserve and propagate mangrove genetic resources.
Option 2 states that Sunderbans is a part of the delta formed by the rivers Ganga, Brahmaputra, and Meghna. This statement is also correct. Sunderbans is located in the delta region formed by the confluence of these rivers in the Bay of Bengal.
Option 3 states that Sunderbans has extensive mangrove forests. This statement is correct as well. Sunderbans is known for its dense mangrove forests, which are home to a wide variety of plant and animal species.
Therefore, all three statements are correct. The correct answer is option 4.