The correct representation of the distinguishing features of the terms is:
A postulate is assumed to be true, and it does not have to be proven.
Here’s a brief clarification of the other terms:
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Theorem: A theorem is a statement that has been proven to be true based on previously established statements, such as other theorems, axioms, and postulates.
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Definition: A definition is a statement that explains the meaning of a term or concept, not something that must be proven true.
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Conjecture: A conjecture is a statement that is suspected to be true based on observation, but has not yet been proven.
Thus, the only accurate response from the options provided is regarding postulates.