Which of the following is a key difference between wiping over leather socks and wiping over a bandage?

Wiping over Bandages, Splints, and Plasters (المسح على الجبيرة)

• Leather socks have no time limit, while bandages expire in 24 hours.
• Bandages require being in a prior state of purity (Wudu) before application, while socks do not.
• Bandages do NOT require prior Wudu and have no time limits, while socks require prior Wudu and are strictly time-limited.
• Wiping over bandages is only allowed for travelers.