Which of the following are Section 1231 assets?

Which of the following are Section 1231 assets? Explain. Assume all the items have been held long-term.
a. Machinery used in the business
b. Personal home
c. Factory building
d. Land held as an investment
e. Land used in a business
f. Shares of stock in Jones Corporation
g. Inventory
h. Musical composition held by the composer