A prefix segment is a global segment, so a prefix SID is globally unique within the segment routing domain.
An adjacency segment is a local segment, so the adjacency SID is locally unique relative to a specific router.
https://www.cisco.com/c/en/us/td/docs/iosxr/ncs5500/segment-routing/61x/b-segment-routing-cg-ncs5500/b-segment-routing-cg-ncs5500_chapter_01.pdf
Option D is correct.
An adjacency segment is identified by a label called an adjacency SID, which represents a specific adjacency, such as egress interface, to a neighboring router. The adjacency SID is distributed by IS-IS or OSPF.
The adjacency segment steers the traffic to a specific adjacency.
About Segment Routing:
An adjacency segment is a local segment, so the adjacency SID is locally unique relative to a specific router
Read the "Segments" section:
https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/segment-routing/configuration/guide/b-seg-routing-cg-asr9k/b-seg-routing-cg-asr9k_chapter_010.pdf
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