First of all the question asks to choose two. Second of all, as the name indicates the Source Guard feature determines if the source of a traffic is coming from a prefix or address in the binding table. Binding table entries are populated using mechanisms like ND. So saying "It works independent from IPv6 neighbor discovery." is WRONG. So "one" of the two correct answers can not be A.
The given answer is correct
IPv6 Source Guard blocks any data traffic from an unknown source. For example, one that is not already populated in the binding table or previously learned through Neighbor Discovery (ND) or Dynamic Host Configuration Protocol (DHCP) gleaning.
yeap :It filters inbound traffic on L2 switch ports that are not in the IPv6 binding table,
https://networklessons.com/cisco/ccie-routing-switching-written/ipv6-source-guard
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