【单项选择题】
Your company has 250 client computers connected to the office LAN. The company has a pool of five public IP addresses. All client computers have dynamically assigned IP addresses. You need to provide all client computers with Internet access.<br />  What should you use？（）<p> Your company has 250 client computers connected to the office LAN. The company has a pool of five public IP addresses. All client computers have dynamically assigned IP addresses. You need to provide all client computers with Internet access.<br />  What should you use？（）</p>
A、A. DHCP Relay Agent
B、B. Routing Information Protocol （RIP）
C、C. Internet Group Management Protocol （IGMP）
D、D. Network Address Translation （NAT）/Basic Firewall
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