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The correct answer is option 2, which includes statements 1, 2, and 3.
1. The first statement is accurate. After the disintegration of Yugoslavia, Montenegro and Serbia agreed to form a new federation called Serbia and Montenegro in 2003, which lasted until 2006 when both countries declared independence.
2. The second statement is also correct. Croatia was indeed under Hungarian rule until the end of the First World War. After the war, Croatia joined the Kingdom of Slovenes, Croats and Serbs, which was subsequently renamed as Yugoslavia.
3. However, the third statement is incorrect. The place in contention has been an issue between Greece and North Macedonia (formerly known as the former Yugoslav Republic of Macedonia), not Belgium and Greece.
4. The fourth statement is incorrect as well. Slovenia declared independence from Yugoslavia in 1991, not from Czechoslovakia.
Therefore, statements 1 and 2 are correct, but 3 and 4 are not, making option 2 the correct answer.