The correct answer is option 2, "Ten." The United Nations Security Council has a total of 15 members, consisting of 5 permanent members and 10 non-permanent members. The 5 permanent members are the United States, United Kingdom, France, Russia, and China. These countries are permanent members because they hold veto power, which means they can block any resolution from being adopted by the Security Council.

On the other hand, the non-permanent members are elected by the General Assembly for a two-year term. They are selected to represent different geographical regions of the world. These non-permanent members do not have veto power, but they do have the opportunity to participate in the decision-making process of the Security Council.

Therefore, the correct answer is "Ten" non-permanent members of the United Nations Security Council.