At a stop on «أَحَدْ», what is correct for the final dāl?

Correct Vowel Articulation — Fatḥah, Kasrah, Ḍammah, Ishbāʿ and Sukūn

• Add a new fatḥah
• Keep it sākin with qalqalah
• Turn it into madd wāw
• Drop the dāl