Which interpretation best fits “إِنَّمَا” in context?

Qasr by Coordination, Negation–Exception, and Innamā

• Scholarly analyses of innamā — Only; indeed no more than.
• Selecting a restriction device — Coordination, negation–exception, and innamā.
• Coordination and qasr al-ifrād — Zayd is a poet, not a writer.
• Lākin and corrective contrast — Zayd is not a writer, but a poet.