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