An attacker is launching a DoS attack on the Company network using a hacking tool designed to exhaust the IP address space available from the DHCP servers for a period of time. Which procedure would best defend against this type of attack？ （）
- A Configure only trusted interfaces with root guard.
- B Implement private VLANs （PVLANs） to carry only user traffic.
- C Implement private VLANs （PVLANs） to carry only DHCP traffic.
- D Configure only untrusted interfaces with root guard.
- E Configure DHCP spoofing on all ports that connect untrusted clients.
- F Configure DHCP snooping only on ports that connect trusted DHCP servers.
- G None of the other alternatives apply