A router has two FastEthernet interfaces and needs to connect to four vlans in the local network.How can you accomplish this task,using the fewest physical interfaces and without decreasing network performance?（）

• A、Add two more FastEthernet interfaces.
• B、Add a second router to handle the vlan traffic.
• C、Use a hub to connect the four vlans with a FastEthernet interface on router.
• D、Implement a router-on-a-stick configuration.