Network management helps you to (66) the s

问题：

Network management helps you to (66) the strengths and weaknesses of your network, as well as determine any configuration changes that may be necessary. Any controlled changes to your network and its components-especially configurations, software and (67) , can have an effect on its overall efficiency. To maintain control, you need the tools and knowledge to manage all activity that has the potential to affect your (68) .

A．wire

B．cabling

C．user

D．computer