Which prefix identifies a link-local IPv6 address?

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Link-local IPv6 addresses are meant for communication only on the same physical or logical network segment and are automatically configured on every IPv6-enabled interface. They provide the essential local-link functions (like neighbor discovery and router solicitation) without needing any router or global routing. The block FE80::/64 is the typical designation for these on a link, with the remaining 64 bits used for the interface identifier. Since these addresses are scoped to the local link, they are not routable beyond that link, which is exactly what you need for on-link communications.

The other options point to different concepts: FC00::/7 is for unique local addresses used privately within an organization; ::1/128 is the loopback address for the local host; FE00::/64 is not the standard link-local block and isn’t used for typical IPv6 link-local addressing.