Which is a valid analysis of lahum in fa-lahum ajrun ghayru mamnūn?

Supplementary Practice 26 — Comparative Rhetoric of Sūrat al-Qāriʿah and Sūrat al-Tīn

• An oath particle that makes ajr genitive
• The passive subject of a perfect verb
• A fronted prepositional predicate, with ajrun as delayed subject
• An accusative cognate object with a jussive subject