中国大学MOOC: They cut discarded books from bindings so the paper could be recycled.

Which three statements are true about DAI？（） A: DAI intercept all ARP packets on untrusted ports B: DAI determines the validity of an ARP packet based on the valid MAC address-to-IP address bindings stored in the DHCP Snooping database. C: DAI is used to prevent against a DHCP Snooping attack. D: DAI forwards all ARP packets received on a trusted interface without any checks. E: DAI forwards all ARP packets on untrusted ports. F: DAI determines the validity of an ARP packet based on the valid MAC address-to-IP address bindings stored in the CAM table.

Select all proposals for WTO governance reform.（ ） A: an adjustment relevant to tariff bindings, which would allow developing countries to increase their tariff rates without limited by scheduled commitments unilaterally when necessary B: the suspension of the application of the WTO’s anti-dumping provisions to developing countries would be reasonable and beneficial to their development C: agreements on development facilitation D: the use of government subsidies for industrial promotion