Which three LSA types can each trigger a partial SPF? (Choose three.)

Type 1 Router LSAs describe all of a router's links and their states, forming the nodes of the intra-area SPF tree; any change to a Type 1 LSA requires a full SPF recalculation to rebuild the shortest-path tree.

Type 2 Network LSAs represent the pseudo-node for multi-access segments and are integral to the intra-area SPF tree; changes to them require a full SPF recalculation, not a partial one.

Type 3 Summary LSAs are generated by ABRs to advertise inter-area prefixes and do not alter the intra-area SPF tree structure; a change only requires updating the leaf routing table entries, which is a partial SPF operation.

Type 4 ASBR Summary LSAs identify the location of an ASBR and, like Type 3 LSAs, sit outside the SPF tree as leaf entries; changes to them trigger a partial SPF rather than a full topology recalculation.

Type 5 External LSAs describe routes redistributed into OSPF from external domains and are attached as leaf nodes to the SPF tree; updates to these entries require only a partial SPF to refresh the affected routing table prefixes.