Which of the following exchanges of property are like-kind exchanges?
a. Land traded for an airplane.
b. A warehouse used in a trade or business exchanged for land to be used as a personal residence.
c. Land in Greece held as an investment for a hotel in Rome.
d. A personal use computer for a business computer.
e. Business machines traded by Marcus and Travis. Marcus will use his new machine in his business. Travis uses his old machine and the machine from Marcus for personal use.