Explanation:

The Group of Twenty (G20) consists of the world's major economies and includes:

1. Founded in 1999: The G20 was indeed established in 1999 in response to financial crises, serving as a forum for international economic cooperation.

2. Annual summits: The G20 summit is held annually under the presidency of a member nation, decided on a rotational basis.

3. Global representation: G20 members represent about 85% of global GDP, showcasing their significant economic influence.

4. Composition: The G20 includes 19 countries plus the European Union, totaling 20 members but not exactly "twenty countries".

Answer: Option 4 - The G20 comprises twenty countries.