Which description best fits ikhfāʾ?

Sākin Nūn & Tanwīn — Iẓhār, Idghām, Qalb and Ikhfāʾ

• Pronounce a separate clear n without ghunnah
• Turn the n into a lām
• Convert every n to mīm
• Conceal the n-sound with ghunnah before the next letter