The accurate representation of the distinguishing feature for each term is as follows:
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Postulate: "A postulate is assumed to be true, and it does not have to be proven." (This statement is correct.)
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Conjecture: "A conjecture tells you what a term means or what to do with a concept." (This statement is incorrect. A conjecture is an educated guess or a statement that is believed to be true based on observations but has not yet been proven.)
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Definition: "A definition is a statement that is made based on observations that must be proven true." (This statement is incorrect. A definition explains the meaning of a term or concept but does not require proof.)
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Theorem: "A theorem is assumed to be true, and it does not have to be proven." (This statement is incorrect. A theorem must be proven true based on axioms, definitions, and previously established theorems.)
Therefore, the only accurate statement is the one regarding postulates:
A postulate is assumed to be true, and it does not have to be proven.