Peter,a British Citizen,and Keith,a U

Peter,a British citizen,and Keith,a U.S.citizen,are employees of an electronics manufacturing company headquartered in London.While Peter works out of the London office,Keith operates out of the marketing unit in New York.Which of the following statements is true in this scenario?

A) Peter is a host-country national.
B) Peter is a parent-country national.
C) Peter and Keith are expatriates.
D) Keith is a third-country national.
E) Keith is a home-country national.