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Which AWS deployment strategy stands up an entirely parallel environment, switches traffic at the LB layer, and allows instant rollback by swapping back?
AAll-at-once deployment with no rollback
BBlue/Green deployment
CManual SSH-and-restart on every host
DDisabling health checks
Answer & Solution
Correct answer: B. Blue/Green deployment
Blue/Green is the canonical zero-downtime rollback-safe pattern (per SAP-C02 §3.1). All-at-once has no rollback; manual SSH doesn't scale; disabling health checks is reckless.
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