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.