What happens to the sākin nūn in الْإِنْسَانَ?

Al-ʿAṣr and At-Takāthur: Applied Ghunnah, Madd, Lām and Waqf

• Ikhfāʾ because sīn follows
• Iẓhār because ʿayn follows
• Idghām without ghunnah due to lām
• Iqlāb because bāʾ follows