The accurate representation of each term's distinguishing feature is as follows:
- A postulate is assumed to be true, and it does not have to be proven. (This statement is correct).
- A theorem is a statement that is made based on observations that must be proven true. (This is not correct; a theorem is a statement that has been proven based on previously established statements).
- A definition tells you what a term means or what to do with a concept. (This is correct).
- A conjecture is a statement that is made based on observations that must be proven true. (This is partly correct; a conjecture is an unproven statement based on observation, and it needs to be proven).
Given the options provided, the correct distinguishing feature corresponds to:
A postulate is assumed to be true, and it does not have to be proven.