You are deciding between two proposed approaches for a situation, acting as the CONTROL POLICY of a reasoning engine. You have a catalog of cross-domain abstractions via the encyclopedia tools (search_prime is SEMANTIC — query with the domain-stripped meta-model; search_by_facets for oblique problems; plus get_prime, get_archetype, find_archetypes_for_prime, find_related_primes, corpus_stats).

You have a VERB LIBRARY (below). Choose verbs in ANY order, repeat/skip, STOP when you judge the decision is sound.

VERB LIBRARY (apply in ANY order, repeat, skip, STOP when ready): match (retrieve: query search_prime with the domain-stripped meta-model; search_by_facets for oblique problems) | salience-rank | prune | compose (typed relational model) | lift (abstraction: step back to the underlying structure; bring a retrieved pattern's logic to bear) | lower (instantiate) | transport (retrieve+map) | decompose (framed prime -> structural core) | evaluate-fit (gate against known failure conditions) | reconcile.

SITUATION.
A high-traffic online service suffers intermittent total outages: a modest request spike slows a few backend nodes, clients auto-retry, retries pile onto the struggling nodes, and the whole service saturates until operators manually shed traffic. Two fixes are proposed; you must pick ONE to implement first.

Approach A: Add per-service circuit-breakers, backpressure, and jittered/backoff retries: when a node slows, callers trip a breaker and stop hammering it, and retries are spread out.

Approach B: Impose an aggressive global request rate-limit at the front gateway: cap total incoming requests well below peak so the backend is never overloaded.

DECISION REQUIRED: Which approach should be implemented first, and why? Choose exactly one. (you must choose Approach A or Approach B)
SUCCESS CRITERIA: A localized slowdown must stay localized (no full saturation) AND normal traffic must not be routinely degraded.


End your response with a fenced block EXACTLY:
===DECISION_BEGIN===
DECISIVE_FACTOR: <one sentence: the single consideration that most determines your choice>
CHOICE: <A or B>
JUSTIFICATION: <2-4 sentences, plain domain terms; do NOT name any catalog/framework/method/prime/archetype/this exercise>
===DECISION_END===
Above the block, show your working (the steps/verbs you ran). Write your ENTIRE response to: experiments/project04_faithfulness_2026-05-25/outputs_full/b_FC1_Bp.md