In JIRA, data integrity during the import and export process can be ensured by using standardized formats such as XML or CSV. These formats help maintain the structure and integrity of the data being transferred, reducing the risk of data loss or corruption. XML and CSV files are easily readable and compatible with various systems, making them ideal for importing and exporting data while preserving its integrity.

The JIRA database stores all the issue data used by the application, including details about projects, workflows, users, and their activities.

When integrating JIRA with external tools, it's important to define clear processes and workflows. This ensures smooth communication and collaboration between JIRA and other tools, leading to better project management and efficiency.

A post-function in a JIRA workflow is an action that occurs after a transition is executed, such as sending notifications, updating fields, or triggering additional processes. It allows for automation and customization of workflow behavior based on specific events, enhancing the efficiency and effectiveness of the workflow. Understanding post-functions is important for configuring workflows to meet the specific needs of the project and team.

In JIRA, a project serves as a container for organizing and managing issues, which can represent tasks, bugs, features, or any other unit of work within the project.

The "Sub-task" issue type in JIRA is typically used to represent a small, well-defined piece of work within a larger project. Sub-tasks are often used to break down larger tasks or user stories into more manageable sub-components, allowing for better tracking and management of work. They are commonly used to divide work among team members or to represent tasks that are required to complete a larger user story or task.

The "Project Key" in JIRA is a unique identifier assigned to each project, used in issue keys and project URLs. It is important because it helps in differentiating between projects, allowing for easier navigation and referencing within JIRA.

Issue naming conventions play a crucial role in reporting and tracking progress by facilitating categorization. Consistently formatted names enable users to quickly identify the type, priority, and status of an issue, making it easier to generate accurate reports and monitor project progress effectively.

To automatically transition issues to the "In Progress" status when assigned to a team member, you would configure an automation rule triggered by Issue Transition. This rule would initiate the transition whenever an issue moves from unassigned to assigned status.

The correct option is Option 4: Sprint Burndown. A burndown chart displays the amount of work remaining in a sprint. It is an essential tool for Agile teams to track their progress and ensure they are on track to meet their sprint goals.