竣工图一般分为四类：利用施工蓝图改绘的竣工图、在二底图上修改的竣工图、重新绘制的竣工图和用CAD绘制的竣工图。( )

Which of the following policy tools is the least likely to be available to the U. S. Federal Reserve Board（）

A. Setting the discount rate at which banks can borrow from the Federal Reserve.

B. Requiring the banking system to tighten or loosen its credit policies.

C. Increasing or decreasing bank reserve requirements.