The Nairobi Package, adopted at the 10th WTO Ministerial Conference in December 2015, included significant decisions such as the elimination of agricultural export subsidies, a package for Least Developed Countries (LDCs) including preferential rules of origin (Statement 2 is correct), and a Ministerial Decision on Public Stockholding for food security purposes (Statement 3 is correct, as the decision addressed this issue and committed to finding a permanent solution). Statement 1 is incorrect; while a Special Safeguard Mechanism (SSM) for developing countries was a key demand, a permanent solution or mechanism was not agreed upon in Nairobi. The statement "No safeguard mechanism... adopted" is a potentially misleading description of the outcome; the issue remains unresolved, not definitively rejected from future consideration, and the phrasing doesn't accurately reflect the debate or outcome.