What are three benefits of implementing vlans？（）

• A、A more efficient use of bandwidth can be achieved allowing many physical groups to use the same network infrastructure
• B、Broadcast storms can be mitigated by decreasing the number of broadcast domains，thus increasing their size
• C、A higher level of network security can be reached by separating sensitive data traffic from other network traffic
• D、Port-based vlans increase switch-port use efficient，thanks to 802.1Q trunks
• E、A more efficient use of bandwidth can be achieved allowing many logical networks to use the same network infrastructure
• F、Broadcast storms can be mitigated by increasing the number of broadcast domains，thus reducing theirsize
• G、VLANs make it easier for IT staff to configure new logical groups，because the vlans all belong to thesame broadcast domain