Which phrase correctly expresses “three men”?

Number Nouns: Rules from One to One Thousand

• ثَلَاثُ رِجَالٍ
• ثَلَاثَةُ رَجُلًا
• ثَلَاثَةُ رِجَالٍ
• ثَلَاثَةٌ رِجَالًا