A transformed service starts without error. What has that demonstrated?

The correct answer is that startup only shows the code compiles and initialises, not that business calculations match the legacy program. Startup exercises initialisation and configuration. Business logic runs when requests arrive, and a program that computes the wrong figure starts exactly as cleanly as one that computes the right one. The claim that the transformation preserved the original logic because incorrect logic prevents startup is wrong because logical errors do not prevent a service from starting. The claim that all dependencies produce correct results because they were resolved at startup is wrong because resolving a dependency says nothing about the results it returns. The claim that regression testing can be limited to startup paths is wrong because startup paths are a small and unrepresentative fraction of the code. For the exam, do not accept startup as a validation signal.