How can you mark a task as completed?

To mark a task as completed, selecting "Mark as completed" from the Actions column dropdown is the most direct and appropriate method. This option is explicitly designed to indicate the completion of a task within the task management system. It provides a clear and accessible way for users to manage their tasks without confusion, ensuring that the task status is updated accurately.

Other options may seem feasible at a glance, but they do not align with the standard functionality provided by task management tools. For instance, checking a box in the Due Date column or dragging tasks between tabs could present a less straightforward method and might not guarantee that the task state is updated effectively. Right-clicking a task could offer various context options, but it may not specifically include a clear choice for completing the task. Therefore, using the dropdown to select "Mark as completed" is the recommended and efficient way to manage task completion status.