A developer asks Claude Code to refactor an authentication module spanning 12 source files, 3 configuration files, and 4 database migration scripts. Which execution mode is most appropriate for this change?

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B. Plan Mode — the change spans multiple system layers, touches high-risk components (auth and migrations), and errors would be difficult to reverse. Plan Mode is appropriate when changes are large in scope, touch multiple system layers, involve high-risk components (authentication, database migrations), or could produce consequences that are difficult to reverse. The CCA-F exam guidance specifically identifies changes touching more than 3–5 files, changes to core business logic, and modifications to production configurations as Plan Mode scenarios. Option D overstates the threshold — changes to a single file can often be handled with Direct Execution.

A developer asks Claude Code to refactor an authentication module spanning 12 source files, 3 configuration files, and 4 database migration scripts. Which execution mode is most appropriate for this change?

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