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A blue/green deployment strategy on cloud platforms primarily:
AEncrypts the network with two-coloured packets
BRuns two parallel environments (old = blue, new = green); cutover by switching the load balancer / DNS once green is verified
CPicks the cheaper of two regions at random
DSequentially deletes every old VM before any new VM is created
Answer & Solution
Correct answer: B. Runs two parallel environments (old = blue, new = green); cutover by switching the load balancer / DNS once green is verified
Blue/green keeps blue serving traffic while green warms up; once green is healthy, traffic flips. Roll-back is just flipping back. The other options describe unrelated patterns.
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