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The correct answer is option 4: Neither 1 nor 2.
Option 1 states that currently three waterways have been declared as the national waterways of India. However, this statement is incorrect. As of now, there are 111 national waterways in India, not just three. These national waterways have been designated by the Government of India for the purpose of inland water transportation.
Option 2 states that the Sadiya-Dhubri stretch of river Brahmaputra is the longest national waterway. This statement is also incorrect. The Sadiya-Dhubri stretch of river Brahmaputra is not a national waterway. In fact, there is no specific stretch of Brahmaputra that has been designated as a national waterway.
Therefore, both statements are incorrect. The correct answer is option 4: Neither 1 nor 2.