An environment has a DC server and an Exchange server. The administrator needs to install a patch and restart both servers while minimizing downtime. Which of the following is the BEST way to restart the servers?（）

• A、Restart both servers at the same time so the servers are down at the same time.
• B、DC server first, then the Exchange server second.
• C、The order in which the servers are restarted does not matter.
• D、Exchange server first, then the DC server second.