Which playbook feature allows concurrent execution of tasks?

The correct answer identifies 'Parallel tasks' as the feature that enables the concurrent execution of tasks within a playbook. This feature allows multiple tasks to be executed simultaneously rather than sequentially, which can greatly improve efficiency and speed in operational workflows.

Parallel tasks are particularly useful in scenarios where tasks are independent of one another, allowing the system to optimize resource usage and reduce total execution time. This is essential in environments that require fast response times and real-time processing, such as incident response or large-scale data processing.

In comparison, automation tasks refer to predefined actions that are automatically executed based on certain triggers but do not inherently facilitate concurrency. Manual tasks involve human intervention, making them inherently sequential, and conditional tasks depend on specific conditions being met before proceeding, which can also limit concurrency based on the conditions required for each task.