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The correct answer is option 1, which states that all three statements about Nathu la Pass are correct.
Statement 1 is true as Nathu la Pass is located on the border between Sikkim in India and Tibet in China. It serves as a strategic link between the two regions.
Statement 2 is also true as Nathu la Pass was a part of the ancient Silk Route. The Silk Route was an ancient trade route connecting China, India, and the Mediterranean region. Nathu la Pass served as an important passage on this route.
Statement 3 is correct as well. Nathu la Pass was closed for several decades due to various geopolitical reasons. However, it was reopened in the year 2006 after extensive negotiations between India and China.
Therefore, option 1 is the correct answer as it includes all the correct statements about Nathu la Pass.