The correct answers are Add a post function to the Closed transition to set the resolution and Use the bulk transition operation so workflow post functions execute for each ticket.

Add a post function to the Closed transition to set the resolution is correct because a workflow post function runs when an issue goes through that transition and it can set the system Resolution field automatically. Adding the post function ensures that every time issues are transitioned to Closed the resolution value is populated by the workflow rather than relying on users to set it manually.

Use the bulk transition operation so workflow post functions execute for each ticket is correct because a bulk transition performs the actual workflow transition for each selected issue and that causes the transition post functions to run. A plain bulk edit or a move will not trigger those transition post functions so they will not populate resolution via the workflow.

Move the tickets to another project with the bulk move operation is incorrect because moving issues to another project does not execute the Closed transition post functions and it will not automatically set resolution on issues that are already closed. The move operation does not trigger the same workflow transition logic that running the Close transition does.

Edit the tickets with a bulk edit to populate the resolution field is incorrect because a bulk edit that simply changes fields does not run workflow transition post functions and it can bypass workflow rules. The Resolution field is often intended to be set during a transition and it may not be available or appropriate for arbitrary bulk edits.

Add the Resolution field to the issue screens so users can fill it manually is incorrect because exposing the field lets users set it manually but it does not ensure the field is set when issues are closed and it allows inconsistent or missing values. The recommended approach is to set resolution during the Close transition with a post function so the value is enforced.

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