企业管理的第一个层级别是（）。

A.文化管理

B.战略管理

C.经验管理

D.效率管理

The growth of switching has (135) a new generation of network management tools that help (136) cope with the challenges, (137) them to correlate device alarms in order to (138) pinpoint root causes, or to monitor service levels without depending on IP subnet schemes. These new tools have become essential to coping with the primary (139) effect of any treatment that significantly increases network flexibility: added complexity.

A．create

B．creates

C．created

D．creating