Which description includes both features of the final sitting taught in this source passage?

The Pillars of Prayer Part 3: Final Sitting and Exit from Prayer

• Sitting for any brief moment before the pillars are complete.
• Sitting after the pillars for the duration of the Tashahhud.
• Standing after the pillars for the duration of the Tashahhud.
• Sitting after the pillars for an unspecified instant only.