SRE and DevOps fundamentals sample question with answer 89

Question:
Which of the following explains the concept of blue-green deployment?

1. The end user (Blue) is able to self-serve, allowing them to initiate a process (Green) without any aid
2. A process in which both hardware and software are prepared and ready for operation in two live environments
3. There are two identical production environments in which one is live (Blue) and the other is idle (Green). When new software is fully tested and deployed to Green, the router switches traffic from Blue to Green
4. A method in which "Blue" maintains the control of the system and "Green" upgrades the application on the server

Answer:
C - is the correct answer