[单选题]

You need to decide on which trunking method to implement in the Ezonexam network. What is a characteristic of ISL and 802.1q frame. tagging in a switched LAN environment?
A．They are used to find the best path through a network.
B．They allow the exchange of filtering tables.
C．They specify different implementations of the Spanning-Tree Protocol.
D．They allow the exchange of routing tables
E．They provide inter-switch VLAN communication.

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