Which of the Following Would Not Be Considered in the Underground

Which of the following would not be considered in the underground economy?

A) The waiter who reports a small fraction of his actual tips.
B) The housecleaner who requests payment in cash.
C) The person who helps his neighbor build a fence, in return for the neighbor helping him paint his house.
D) The homemaker who shops, cooks, does laundry, and cleans house.
E) All of these are considered to be in the underground economy.