A big company was built in our city in 2011, ______ a lot of job opportunities for the unemployed. [ ]

A. to create      

B. created        

C. creating      

D. having created

重空库作为高风险部位，核心银行系统重空库交易的操作员与实物管理人员（即管库员）应相互分离，不得混岗操作。