What is the earliest point when the upgrade is considered complete and you can allow all dialog users to log on to the system?

You are performing an upgrade of an SAP ECC development system with SUM.

What is the earliest point when the upgrade is considered complete and you can allow all dialog users to log on to the system? Please choose the correct answer.
A . After the SUM roadmap step "Execution" is finished and before "Postprocessing"
B . During the SUM roadmap step "Postprocessing", after the post procedure steps are complete
C . During the SUM roadmap step "Postprocessing", in parallel with post procedure steps
D . After the SUM roadmap step "Postprocessing" and post procedure steps are finished

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Answer: B