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單項選擇題

Users report that they are unable to connect to a server. An administrator confirms that it is unreachable across the network. Other administrators have been working in the server room throughout the day. 
Which of the following is the NEXT step the administrator should take？（）

A. Verify the configuration of the connected port on the network switch.
B. Reboot the server.
C. Install a new NIC on the server.
D. Verify that network cables are connected.

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