Answer:
a. Detached duty employee
Explanation:
For example, Google has its headquarters in the USA, you get a job in Google and they ask you to go work in the branch of the company that is located in Singapore, if you go there you would be a detached duty employee, because you are detached from your original place of work and have gone into other place to work, the people that are fmor singapore and work in the google offices in singapore are host-country national. So the answer would be a. Detached duty employee