Your network contains a server named Server1. Server1 runs Windows Server 2008 R2 and has a single network connection. The connection is configured to use a default gateway address of 10.0.0.1.The default gateway has a metric value of 100.You configure a second default gateway that uses an address of 10.0.0.2.You need to ensure that 10.0.0.2 is only used as the default gateway if 10.0.0.1 is unreachable. What should you do？（）

• A、For the interface, set the interface metric to 100.
• B、For the 10.0.0.2 gateway, set the metric to 50.
• C、For the 10.0.0.2 gateway, set the metric to 200.
• D、For the 10.0.0.1 gateway and the 10.0.0.2 gateway, enable automatic metric.