Which statement correctly explains the aspect “Restricting the subject to a property” in the example “مَا زَيْدٌ إِلَّا كَاتِبٌ”?

Qasr by Coordination, Negation–Exception, and Innamā

• Restricting the subject to a property — Zayd is only a writer.
• Readings and syntactic analysis — He prohibited carrion to you.
• Four devices of restriction — Restriction through coordination.
• Restriction using bal — Zayd is not a writer but a poet.