The DAI feature has been implemented in the Company switched LAN. Which three statements are true about the dynamic ARP inspection （DAI） feature？ （）
- A DAI can be performed on ingress ports only.
- B DAI can be performed on both ingress and egress ports.
- C DAI is supported on access ports， trunk ports， EtherChannel ports， and private VLAN ports.
- D DAI should be enabled on the root switch for particular VLANs only in order to secure the ARP caches of hosts in the domain.
- E DAI should be configured on all access switch ports as untrusted and on all switch ports connected to other switches as trusted.
- F DAI is supported on access and trunk ports only.