Definition of Done list completion

[Nelly F]

When there is a list of tasks on the Definition of Done using checklist and not stantard text field, who mark the tasks as done, in other words who mark the checkboxes for each task as done? Is it the team member who worked on that particular task or do the tasks get marked as done when the Jira ticket resolution is changed to Done and ready to be closed?  If none of those, please explain.  Thank you for your time.