Indicate with a "Yes" or a "No" Which of the Following

Indicate with a "yes" or a "no" which of the following are like-kind exchanges (assume all assets are held for business or investment purposes).
a.Exchange of common stock held as an investment for land held as an investment.
b.Exchange of farmland for an apartment building.
c.Exchange of office furniture used in trade or business for computer used in a trade or business
d.Exchange of unimproved real estate for improved real estate.
e.Exchange of automobile used in trade or business for office building used in trade or business