Choose the correct analysis of «مُوسَىٰ» in «مَرَرْتُ بِمُوسَىٰ».

The Rule of the Muʿrab: Visible and Estimated Case

• Accusative object, overt fatḥa
• Nominative subject, estimated ḍamma
• Genitive noun, estimated kasra
• Indeclinable noun, accusative position