Option 2: "Blocks" is the correct option. When a critical bug needs to be fixed before any further work can proceed, it is essential to indicate that it blocks other issues in the project. This link type signifies that the issue must be resolved before progress can be made on dependent issues. By using the "Blocks" link type, you explicitly communicate the critical nature of the bug and its impact on the project timeline and workflow.

In JIRA, users can be assigned to specific roles within a project. Roles determine the level of access and permissions a user has within that project, such as project administrator, developer, or reporter. Assigning users to roles helps in managing project activities effectively.

Kanban boards use arrows to indicate the flow of work from one column to another. This visual representation helps team members understand how work progresses through the workflow.

In JIRA, a "security level" is used to control who can view or edit specific issues. It allows administrators to restrict access to sensitive information by assigning different levels of security to issues based on user roles or groups.

Routine maintenance should be performed to ensure that the JIRA system is running smoothly and efficiently. This includes tasks such as database cleanup, index optimization, and monitoring system health. Regular maintenance helps prevent performance issues and ensures that the system operates optimally.

In JIRA, you can add a new status to an existing workflow by using the "Add Status" button in the workflow editor. This allows you to customize the workflow without directly editing it, ensuring better maintenance and organization.

Queues in JIRA Service Desk help prioritize and manage incoming service requests by categorizing them based on specific criteria, such as issue type, priority, or assigned agent, facilitating efficient handling and resolution.

Release frequency is the Agile metric used to measure how often new versions of the software are deployed or released to users. It indicates the pace at which the development team delivers value to stakeholders and helps in evaluating the efficiency of the development process.

In a large team, establishing clear roles and responsibilities is essential to prevent chaos. When each team member knows their responsibilities and understands their role within the project, it helps streamline communication, improve accountability, and prevent conflicts or overlapping tasks.

Specific permissions can be granted to a group of users for a project in JIRA by configuring roles. Roles allow administrators to define sets of permissions and associate them with groups of users. By assigning users to appropriate roles within a project, administrators can control access to project resources and streamline collaboration.