Which of the following statements best describes automatic stabilizers Although no legislative action has been taken, automatic stabilizers are programs that apply:（）

A. restraint during a recession and stimulus during an economic boom.

B. restraint during a recession but do not apply stimulus during an economic boom.

C. stimulus during a recession and restraint during an economic boom.

持通行证的人员进出机场控制区，需主动通过出入口验证识别系统。