Please Help :3 Which TWO statements about the Cold War are true?

1. The United States and the Soviet Union both joined NATO to attempt to end the Cold War.
2. The United States and the Soviet Union both started fighting the Cold War prior to 1945.
3. The United States and the Soviet Union had different political and economic ideologies.
4. The United States and the Soviet Union fought a war in Japan for supremacy.
5. The United States and the Soviet Union never officially declared war against each other.