Identify the type of cash flow activity for each of the following events (operating, investing, or financing):
a. Sold equipment.
b. Issued bonds.
c. Issued common stock.
d. Paid cash dividends.
e. Purchased treasury stock.
f. Redeemed bonds.
g. Purchased patents.
h. Purchased buildings.
i. Sold long-term investments.
j. Issued preferred stock.
k. Net income.