Answer:
The correct answer is: buys; increases; decreases.
Step-by-step explanation:
Open market operations refer to the sale and purchase of government securities in the open market. It is a monetary tool used by the central bank to control the money supply.
In an open market purchase, the Fed buys government securities in the open market and pays for these securities. This causes the reserves with commercial banks to increase.
As the banks now have more money to lend or the lending capacity of the bank increases, this causes the interest rates to decline. The federal funds rate is also an interest rate, so it will decline as well.