To satisfy the liquidity needs of the financial system and to keep the financial system from seizing up, within a few hours of the destruction of the World Trade Cente on Tuesday, September 11, 2001, the Fed made an announcement that O A. it was raising the discount rate. B. it was lowering the discount rate. OC. the Federal Reserve System was open and operating and the discount window was available to meet liquidity needs. O D. it stood ready to purchase common stocks to prevent a further slide in stock prices