Hosts on the same VLAN can communicate with each other but are unable to communicate with hosts on different VLANs. What is needed to allow communication between VLANs（）。

• A、a switch with a trunk link that is configured between the switches
• B、a router with an IP address on the physical interface that is connected to the switch
• C、a switch with an access link that is configured between the switches
• D、a router with subinterfaces configured on the physical interface that is connected to the switch