This german-coined term refers to workers who work in a foreign country, as long as there's work available, but who would eventually return to their respective homelands.

a. resident alien
b. guest worker
c. immigrant
d. temporary worker

Option a resident alien

resident it means coming from other place, not permanent, stranger or a foreigner

classification:
1)legal alien -tourists, legal permanent workers, student-visa, and guest workers
2)nonresident alien-tourist,on business,entertainers,sports people,under medical treatment
3)resident alien-temporary resident
4)enemy alien-national enemy
5)illegal alien- unlawfully authorized, overstayed and cross along the border line 

Aregion is an area of land that has common features. these features can be natural, such as climate or landscape. they can also be artificial, such as language or religion. the xinjiang uyghur autonomous region, above, is an area of china inhabited by uyghurs, a muslim group with ethnic ties to turkish people.

Answera discharge of static electricity;