Scenario: A financial institution is upgrading its online banking platform to support new features and services. During testing, discrepancies are found between the behavior described in the models and the actual system behavior. What steps should be taken to resolve these issues and improve the reliability of model-based testing?

To improve the reliability of model-based testing, it is crucial to validate and update the models based on observed discrepancies. Ignoring discrepancies may lead to inaccurate testing results. Re-running tests without addressing model deviations would not address the root cause. Implementing changes in the system to match the models may introduce unnecessary modifications. Therefore, the recommended approach is to validate and update the models to align them with the actual system behavior.