Which statement gives the safest summary?

Cause of Ghayr Munsarif: Feminine Alif and Feminine Proper Names

• All feminine words are ghayr munsarif.
• Every three-letter feminine name is declinable.
• Feminine alif stands for two causes; round tāʾ in a proper name combines formal femininity with proper-name status; semantic feminine names need the additional taught condition.
• Every final alif is feminine alif.