The correct answer is:
All of the options are in a two-column proof.
Explanation:
In a two-column proof, we start with a list of "given" statements. This is the series of statements we begin with in the proof.
Below this, we are given a "prove" statement; this is the statement we are to be working to prove throughout the proof.
We then write two columns; one is labeled "statements," in which we will use steps to get from the "given" to the "prove" statement.
The second column is labeled "reasons" or "justifications"; in this column we justify using theorems, definitions and postulates the statements we use in the proof.
