Which of the following describes a key difference between the tang and song dynasties? a. the song dynasty experienced a golden age, while the tang dynasty did not. b. the song dynasty expanded the borders of the chinese empire, while the tang dynasty did not. c. the song dynasty developed gunpowder weapons, while the tang dynasty did not. d. the song dynasty lasted nearly 300 years, while the tang dynasty did not.

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