Ahistorian compares transcripts of speeches delivered by powerful leaders throughout world history. these transcripts serve as which of the following

When a historian compares transcripts of speeches delivered by powerful leaders throughout world history, these would serve as "primary source documents," since they provide and "unaltered" insight into the past. 

Protecting and assisting  u.s. citizens  living or traveling abroad; assisting u.s.  businesses  in the international marketplace; coordinating and providing support for international activities of other u.s. agencies (local, state, or federal government), official visits overseas and at home, and other diplomatic efforts.keeping the public informed about u.s. foreign policy and relations with other countries and providing feedback from the public to administration officials.providing  automobile registration  for non-diplomatic staff vehicles and the vehicles of diplomats of foreign countries having  diplomatic immunity  in the united states