What are two functions of IPv6 source guard? (Choose two)

What are two functions of IPv6 source guard? (Choose two)
A . It works independent from IPv6 neighbor discovery
B . It denies traffic from unknown sources or unallocated addresses
C . It blocks certain traffic by inspecting DHCP packets for specific sources
D . It uses the populated binding table for allowing legitimate traffic
E . It denies traffic by inspecting neighbor discovery packets for specific patterns

Answer: B D