Which parsing of wa-lā antum ʿābidūn is correct?

Supplementary Practice 22: Comparative Rhetorical Study of Sūrat al-Kāfirūn and al-Naṣr

• Antum is an object and ʿābidūn a past verb
• ʿĀbidūn is a delayed subject and mā aʿbud a prepositional phrase
• Antum is the subject and ʿābidūn its predicate
• Antum is a vocative particle and ʿābidūn the addressee