Which word is the maf'ul bihi in أَكَلَ إِبْرَاهِيْمُ التُّفَّاحَ?

Maf'ul Bihi: The Receiver of the Action

• أَكَلَ
• إِبْرَاهِيْمُ
• التُّفَّاحَ
• no object is present