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Which Application Insights concept lets a developer correlate a single user request across multiple services (web → API → DB → external API) into one trace timeline?
ADisabling logging entirely
BDistributed tracing with `operation_Id` / W3C trace context propagation
CStoring per-service logs in separate, uncorrelated buckets
DReading raw HTTP access logs by hand
Answer & Solution
Correct answer: B. Distributed tracing with `operation_Id` / W3C trace context propagation
Application Insights distributed tracing correlates via operation_Id (W3C-compatible) across services. Other approaches don't correlate.
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