Answer:
buy bonds from a bank, giving the bank cash in return, which it can then lend out.
Explanation:
The above option is the way in which the Feds can increase money supply in the country. For example, if a bank advertise #30 billion worth of bond to the public, the Fed could buy $28 billion worth of bond thereby offering the bank enough liquidity and cash to lend out to those in need of it.