The G4 is a group of countries that are actively seeking permanent membership in the United Nations Security Council. They believe that the current composition of the Security Council is outdated and does not adequately represent the geopolitical realities of the world today. The G4 consists of four countries: Brazil, Germany, Japan, and India.

Option 1: Brazil is one of the countries that make up the G4. They have been advocating for a permanent seat on the Security Council to better represent the interests of Latin America.

Option 2: Germany is also a member of the G4. They have been campaigning for a permanent seat in order to have a stronger voice in decision-making processes within the Security Council.

Option 3: Japan is another member of the G4. They have long been seeking permanent membership in the Security Council to reflect their status as the third-largest economy in the world.

Option 4: South Africa is not a member of the G4. While South Africa has expressed interest in reforming the Security Council, they are not part of the G4 alliance. Therefore, option 4 is the correct answer to this question.

In summary, the G4 consists of Brazil, Germany, Japan, and India. South Africa is not a member of the G4.