A new municipal portal version runs in parallel environment B while production traffic stays on environment A until cutover; rollback means flipping traffic back to A. Which deployment strategy is this?
Select an answer to reveal the explanation.
Short Explanation
Blue-green is like having two complete stages — one lit for the audience (blue) and one ready backstage (green). Flip the lights to cut over; flip them back if the show goes wrong. Parallel full environments plus a traffic switch is the giveaway, not a tiny canary slice or patching the same boxes.
Full Explanation
Blue-green deployment maintains two complete production-capable environments and redirects traffic from the live (blue) stack to the candidate (green) stack at cutover. Rollback is typically a reverse traffic switch rather than a slow rebuild. Canary limits exposure to a subset of users; rolling updates batches within one fleet; in-place changes the existing instances — none match dual-environment cutover.