Companies make sacrifices known as expenses to obtain benefits called revenues. The accurate measurement of net income requires that expenses be matched with revenues. In some circumstances, matching a particular expense directly with revenue is difficult or impossible. In these circumstances, the expense is matched with the period in which it is incurred.

Required
Distinguish the following items that could be matched directly with revenues from the items that would be classified as period expenses:
a. Sales commissions paid to employees.
b. Advertising expense.
c. Supplies.
d. The cost of land that has been sold.