請問8老師，父母移民麵試一定要帶I864和保稅單嗎？

請教8老師，我父母在廣州麵試綠卡移民。他們麵試時需要帶I864和報稅單嗎？我看這個網站上說不用啊

https://travel.state.gov/content/travel/en/us-visas/immigrate/the-immigrant-visa-process/step-10-prepare-for-the-interview.html  

“You do not need to bring your Affidavit of Support or financial evidence you submitted to NVC.”

謝謝指教！