What freedom do Australians have regarding expressing their thoughts?

• They can only write their ideas in private.
• They can freely say and write what they think about any topic.
  Explanation:

  "Australians have the freedom to express their thoughts and opinions openly. This means they can freely say and write about any topic, as long as they do not break laws."
• They need permission to discuss their ideas.
• They can only discuss approved topics.