Which statement correctly explains the aspect “Comparing lā, bal and lākin” in the example “لَا، بَلْ، لَكِنْ”?

Qasr by Coordination, Negation–Exception, and Innamā

• Comparing lā, bal and lākin — Lā, bal and lākin.
• Restrictive force of innamā — The believers are but brothers.
• Word order after innamā — Zayd is only a writer.
• Affirmed and negated sides of lā — Zayd is standing, not sitting.