The correct answer is Estimating the expenses associated with the requested modifications.

Change control at the version control stage is primarily about technical validation, risk assessment, traceability, and approval for code changes so that fixes and features can be merged and released in a controlled way. Estimating costs is normally a budgeting and project management activity and it is therefore least commonly handled inside the version control change control process, especially at a small fintech where cost decisions are often made by product or program management.

Reproducing and analyzing the reported defect is a typical change control activity because teams need to reproduce issues to determine root cause, scope, and an appropriate corrective change before approving commits.

Prioritizing and categorizing incoming change requests is central to change control since it drives which changes are approved, what risk mitigations are required, and the order in which work is performed.

Defining the modified interface that end users will encounter is often part of the change control record because user impact, acceptance criteria, and documentation of interface changes inform testing and approval decisions for the release.

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