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Which DOP-C02 deployment pattern stands up a parallel green environment, smoke-tests it, then switches load balancer traffic from blue to green with instant rollback by switching back?
AManual host-by-host SSH deploy
BAll-at-once without health checks
CCold restart of every host serially
DBlue/Green deployment
Answer & Solution
Correct answer: D. Blue/Green deployment
Blue/Green is the canonical zero-downtime + instant-rollback pattern (per DOP-C02 §1.4). The other options either lack rollback or scale poorly.
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