What is the role of Fardah in fa-taḍammanathā Fardah?

Labīd ibn Rabīʿah: The Departing Caravan, Memory of Nawār and Distant Destinations (Verses 11–19)

• The verb’s subject and a place name
• The object of taḍammanat
• The genitive complement in an iḍāfah
• The consequent of a condition