The process of arbitrage does all of the following EXCEPT:()

A. promote pricing efficiency and produce riskless profits. 

B. result in the correction of mispriced assets. 

C. insure that risk-adjusted expected returns are equal.

特种设备作业人员应在其证书有效期满前（）申请复审。

A、一个月

B、三个月

C、六个月