Which of the Following Accurately Describes a "Just-In-Time" Expatriate

Which of the following accurately describes a "just-in-time" expatriate?

A) Employees sent on overseas assignments from a few weeks to a year in length
B) Employees who must often travel internationally for their jobs, usually on trips lasting from a few days to a few months
C) Employees who live in one country, but commute to work in another country
D) Employees hired as needed from outside the multinational to fill a specific role or particular assignment