Question

Steve wrote the sentence shown below.

“If two lines intersect, then exactly one plane contains both lines.“

Which of these statements is true about what Steve wrote?

It is a postulate because it is a true statement which can be proved.
It is a postulate because it is a statement which is assumed true without proof.
It is a theorem because it is a true statement which can be proved.
It is a theorem because it is a statement which is assumed true without proof