Which statement correctly describes the purity required before putting on the khuffs?

Wiping over Khuffs and Qualifying Thick Socks: Conditions, Duration, and Method

• Both feet must be washed before wearing them, and the rest of Wudu may be completed afterward if no invalidator occurs before completion.
• A person may wear them after washing only one foot.
• No washing is needed before wearing them.
• They must always be worn only after every part of Wudu is fully completed first.