Regarding expatriates, which statement is true?

a) Although in the 1970's expatriates returning from their assignment early (failures) was around 20 percent, that has dropped significantly since 2002.
b) To deal with failure rates, organizations have started hiring foreign nationals for overseas positions.
c) In general both Japan and the USA have similar failure rates for their expatriates.
d) Virtual expatriates are expatriates that move to the overseas country, but tend to do much of their dealings using a computer.