Which of the following statements is true regarding the red assist handle?

The statement regarding the red assist handle being essential to hold while operating doors is correct. This handle is specifically designed to provide additional leverage and control when opening or closing aircraft doors. By holding the red assist handle, crew members ensure a safer operation by maintaining better grip and stability, which is especially important due to the potential weight and size of the doors involved.

Using the assist handle enhances operational safety, making it a critical component of the door operating procedure. In contrast, the other options do not accurately reflect the functional role of the red assist handle in this context, as it is not optional, decorative, or solely for emergencies.