The correct answer is 3. Internet Authority Association (IAA), because it is not a real style of citation. Others are existent and commonly used whereas IAA is not real.
Answer: This is the best I cold do if it is not what you are looking for sorry:)
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Cats make good house pets. It's the main idea in the sentence, and it's independent also. The other clause is dependent, so it is not the main clause.
