Which of the following is a key feature of the Final Cut Pro timeline?

The timeline in Final Cut Pro is a robust feature that enables users to edit video and audio clips in real-time. This is a significant aspect since it allows editors to see the effects of their changes immediately, rather than having to render or wait for changes to process. Real-time editing fosters a more efficient workflow, as it helps in fine-tuning edits, transitions, and effects on-the-fly without significant delays. This capability is essential for maintaining the creative flow during the editing process.

In contrast, other options present limitations that do not reflect the true capabilities of Final Cut Pro's timeline. It can handle both audio and video clips, supports video transitions, and allows for multiple video tracks, making it a versatile tool for various editing tasks. Understanding these features positions users to maximize their editing potential in Final Cut Pro.