Answer: Contractionary open market operation
Step-by-step explanation:
During a period of high employment, high inflation, and unsustainable growth in the economy, the Federal Reserve is most likely to perform a contractionary open market operation, such as selling government securities, to reduce the money supply and slow down the economy. This can help to curb inflation and stabilize growth. By reducing the money supply, it becomes more difficult for banks to make loans, which can slow down spending and bring inflation under control.