Which of the following is required in order to operate in accordance with CEPT rules in foreign countries where permitted?

When a US amateur radio operator travels to a country participating in the CEPT (European Conference of Postal and Telecommunications Administrations) agreement, they are permitted to operate under their US Extra or General class license. To legally prove this authorization to foreign officials, you are required to carry a physical copy of FCC Public Notice DA 16-1048, alongside your US passport and proof of your US amateur license. You are not required to identify in the local language, nor do you append '/CEPT' to your call sign; instead, you prefix your call sign with the specific locator prefix mandated by the host country.