AWS Certified Developer Associate DVA-C02 Practice Question

A blue/green deployment creates a replacement task set in a separate target group, lets you validate the new version, and then redirects production traffic in a single cutover. Because traffic is switched only after the green environment is confirmed healthy, the API remains fully available and you can revert by pointing the load balancer back to the blue environment. Rolling (in-place) and linear or canary updates modify the running tasks; although they minimize risk, they still change the live environment and can reduce capacity or surface issues during the rollout. An all-at-once update replaces every task at once, making downtime likely.