All projects use only a single simplified workflow which has three statuses (Open, In Progress, Closed) and all global transitions.
You need to find all issues that were in the Closed status at some point in their lifecycle.
Select the correct JQL query.
The correct JQL query to find all issues that were in the Closed status at some point in their lifecycle is 'status WAS Closed'. This query searches for any issue that has been in the Closed status regardless of its current status.
C is the correct answer