Choose the correct answer

Why are there no passive voice (مجہول) or passive participle (اسم مفعول) forms in the Sarf Sagheer of Bab Karuma?

Trilateral Bare Regular - Bab 5: Karuma Yakrumu & Intransitive Verbs

• Due to a print constraint
• Because the book's Sarf Sagheer of this door omits them
• Because the verb is too short
• Due to guttural letters