As the network technician at Company， you need to configure DHCP snooping on a new switch.   Which three steps are required？ （）

• A、 Configure the switch to insert and remove DHCP relay information （option-82 field） in forwarded  DHCP request messages.
• B、 Configure DHCP snooping globally.
• C、 Configure the switch as a DHCP server.
• D、 Configure DHCP snooping on an interface.
• E、 Configure all interfaces as DHCP snooping trusted interfaces.
• F、 Configure DHCP snooping on a VLAN or range of VLANs.