Year of Deputation is which Hijrah year?

The 9th year of Hijrah is famously known as the Year of Deputations (Aam al-Wufood). During this significant period, numerous delegations from various tribes across the Arabian Peninsula traveled to Madinah to declare their acceptance of Islam and pledge allegiance to Prophet Muhammad (PBUH). This marked a widespread conversion to Islam and the consolidation of the nascent Islamic state.

• 8 Hijrah (A) was the year of the Conquest of Makkah.
• 10 Hijrah (C) was the year of the Farewell Pilgrimage (Hajjat al-Wada'), which was the Prophet's last Hajj.
• 11 Hijrah (D) was the year of the Prophet Muhammad's (PBUH) demise.