The network administrator has discovered that the power supply has failed on a switch in the company LAN and that the switch has stopped functioning. It has been replaced with a Cisco Catalyst 2950 series switch.What must be done to ensure that this new switch becomes the root bridge on the network?（）

• A、One router is running RIPv1.
• B、RIP neighbor is 224.0.0.9.
• C、The network contains a loop.
• D、Network 10.10.1.0 is reachable.