The Company is concerned about Layer 2 security threats.  Which statement is true about these  threats？ （）

• A、 MAC spoofing attacks allow an attacking device to receive frames intended for a different  network host.
• B、 Port scanners are the most effective defense against dynamic ARP inspection.
• C、 MAC spoofing, in conjunction with ARP snooping, is the most effective counter-measure against reconnaissance attacks that use dynamic ARP inspection (DAI) to determine vulnerable  attack points.
• D、 Dynamic ARP inspection in conjunction with ARP spoofing can be used to counter DHCP  snooping attacks.
• E、 DHCP snooping sends unauthorized replies to DHCP queries.
• F、 ARP spoofing can be used to redirect traffic to counter dynamic ARP inspection.
• G、 None of the other alternatives apply.