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In a source-driven development workflow, the "source of truth" is a version control system, and the primary interface for interacting with the Salesforce platform is the Salesf7orce DX CLI (Option C).8

When a deployment is initiated (using commands like project deploy start or the legacy force:source:deploy), the CLI provides real-time feedback on the status of the deployment. To verify a successful deployment, the CLI returns a detailed summary of the metadata components successfully created or updated, as well as the results of any Apex tests that were required to run as part of the production deployment. If any part of the deployment fails, the CLI provides specific error messages and line numbers, and the entire transaction is rolled back.

Option B (Apex Test Execution) is a component of the verification process, but the CLI is the tool that manages and reports on the overall success. Option A (Migration Tool) is a legacy Ant-based tool that is not the standard for modern source-driven DX projects. Option D is a browser extension for data and metadata inspection but is not a deployment or verification tool. The Salesforce CLI is the backbone of modern CI/CD pipelines and the essential mechanism for verifying deployment integrity.