How many extra Takbirs (Takbirat al-Zawa'id) are performed in total during the two units of Eid prayer?

The Eid Prayers (صلاة العيدين) & Takbirs of Tashriq

• Three (3) extra Takbirs.
• Six (6) extra Takbirs (three in the first rak'ah, three in the second).
• Twelve (12) extra Takbirs.
• Exactly nine (9) extra Takbirs.