The correct distinguishing feature for the terms provided is:
A postulate is assumed to be true, and it does not have to be proven.
Here’s a brief explanation of each term to clarify:
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Definition: It explains what a term means, providing clarity and understanding about a concept.
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Postulate (or axiom): A statement that is accepted without proof; it serves as a foundation for further reasoning and arguments.
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Theorem: A statement that has been proven true based on postulates, definitions, and previously established theorems.
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Conjecture: An unproven statement or hypothesis that is based on observations. It may suggest a potential truth but has not yet been established as a theorem.
So, the mentioned statement about postulates is the distinguishing feature that accurately represents the term.