How is the mīm read in أَلْهَاكُمُ التَّكَاثُرُ in connection?

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

• Sākin with ikhfāʾ
• Sākin with idghām
• Always doubled
• Vowelled with ḍammah