Sub-tasks are a type of issue that can be used to break down a parent issue into smaller and more

manageable pieces. Sub-tasks can be displayed as cards in the Active sprints view of a Scrum board,

which allows you to track their progress and status. However, sub-task estimations are not rolled up

and displayed on the parent card, as they use a different field than the parent issue. Sub-tasks can be

created by anyone who has the Create Issue permission in the project, not only by board

administrators. Sub-tasks cannot be displayed as cards in the Backlog view, as they are only visible

under their parent issues. Sub-tasks will not automatically get resolved when the parent is moved to

the Done column, as they have their own workflow transitions and conditions. Therefore, the correct

answer is C. Reference: [Working with sub-tasks], [Configuring columns]