Which sentence contains a definite idafah as its subject?

Definiteness Through Idafah

• كِتَابُ وَلَدٍ عَلَى الطَّاوِلَةِ
• كِتَابٌ جَدِيدٌ
• فِي الْبَيْتِ كِتَابٌ
• كِتَابُ زَيْدٍ جَدِيدٌ