B (Micro loops):OSPF Loop-Free Alternates (LFA) pre-calculate backup next-hops to reduce transient micro loops during the convergence process when primary routes fail.
Other options explained:
A: DTP relates to trunk negotiation, not loop prevention.
C: STP handles Layer 2 loops.
D: REP is a Cisco Layer 2 redundancy protocol, unrelated to OSPF loop prevention.
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