When to use EFA

For which of these measure development situations would an exploratory factor analysis be appropriate?

50 XP

You are piloting a measure, and the items are clearly assigned to factors based on theory.
press1
You are piloting a measure, but you're not sure which factor(s) each item measures.
press2
You are finalizing a measure that has been previously piloted.
press3
You are drafting items for a new measure.
press4