Government official: Residents who are foreign citizens can serve as public servants at most levels, but not as cabinet secretaries. This is wise, since cabinet secretaries perform some duties that should be performed only by citizens, and no one should be appointed to a position if it involves duties that person should not perform. Moreover, a cabinet undersecretary is expected to serve as cabinet secretary when the actual secretary is unavailable. So, __. Which one of the following most logically completes the government official's statement? ['cabinet undersecretaries should not be expected to stand in for cabinet secretaries', 'only former cabinet undersecretaries should be appointed as cabinet secretaries', 'foreign citizens should not be appointed as cabinet undersecretaries', 'foreign citizens who serve as public servants should be granted citizenship in the country they serve']