You are the administrator of a Windows Server 2003 computer named Server1. You log on to Server1 and attempt to access the network. You discover that the server is not communicating on the network. You discover that a service pack and an updated network adapter driver were installed on Server1 the previous night. A complete backup, including the System State data, was performed before the service pack and the driver were installed. You need to restore network communications. What should you do first? （）

A. Use Roll Back Driver to reinstall the previous driver for the network adapter.
B. Use the Backup or Restore Wizard to restore the backup from the previous night.
C. Restart Server1 by using the Last Known Good Configuration option.
D. Use the Registry Editor to delete the registry settings for the network adapter driver.