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The correct answer is option 4: Russia, Afghanistan, Pakistan, and Tajikistan.
This summit, hosted by the Russian President in August 2010, was held at the Black Sea Resort Sochi. The purpose of the summit was to discuss the pressing issues of terrorism and narcotics. The countries that attended the summit were Russia, Afghanistan, Pakistan, and Tajikistan.
Option 1 (Brazil, Russia, India, and China) is not correct because Brazil and China were not part of this particular summit. Option 2 (Russia, Afghanistan, India, and Pakistan) is also incorrect as it includes India instead of Tajikistan. Option 3 (Russia, Kazakhstan, Tajikistan, and Afghanistan) is not the correct option either as it includes Kazakhstan.
Therefore, the correct answer is option 4 as it accurately identifies the countries that participated in the summit: Russia, Afghanistan, Pakistan, and Tajikistan.