"IPv6 Source Guard and IPv6 Prefix Guard are Layer 2 snooping features that validate the source of IPv6 traffic."
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_fhsec/configuration/15-e/ip6f-15-e-book/ip6f-15-e-book_chapter_0110.pdf
C, D seems more correct for me.
I would say DHCPv6 also prevents snooping, but the question especify "layer 2 snooping" so just Source Guard and prefix Guard work with binding table.
upvoted 3 times
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