Which statement correctly limits the rule?

Causes of Ghayr Munsarif: Proper Names and Foreign Origin

• Every foreign-looking word is ghayr munsarif.
• Every name with more than 3 letters is ghayr munsarif.
• The word must have been a proper name in the non-Arabic language, must meet the letter condition, and must not be one of the established declinable forms.
• Every established declinable form loses tanwin.