Thomas,a South African,is Employed by a Pharmaceutical Company Whose Headquarters

Thomas,a South African,is employed by a pharmaceutical company whose headquarters is in Philadelphia.Thomas operates out of the firm's production facility in Cape Town,South Africa.Thomas is considered to be a(n) :

A) parent-country national.
B) third-country national.
C) host-country national.
D) repatriate.
E) expatriate.