Postman simplifies authentication in API testing by offering integrated OAuth 2.0 support. This feature enables seamless handling of authentication mechanisms, ensuring secure and efficient testing. Testers can avoid manual entry of credentials by utilizing Postman's authentication features, enhancing the testing process.

The priority of a defect is generally determined by its severity level. A defect with higher severity often gets a higher priority as it may have a more significant impact on the overall functionality of the system.

Equivalence Partitioning divides input data into three partitions: valid, invalid, and on the edge. This ensures comprehensive coverage of input scenarios, aiding effective testing.

Functional testing aims to validate the functionality of the system, while non-functional testing focuses on aspects like performance, usability, security, etc., rather than specific functions.

When discrepancies arise between expected and actual results during test execution, it's crucial to verify the test environment setup and data to ensure consistency. Rerunning the test with different configurations may help isolate the issue. Comparing actual results with expected results allows testers to identify deviations and investigate the root cause. Reporting the issue without investigation may lead to unresolved defects and inaccuracies in test reporting.

Proposing a phased approach addresses the team's concerns by allowing gradual adoption, minimizing initial investment, and providing an opportunity to learn and adapt. This approach can demonstrate the benefits of automation over time while ensuring manageable learning curves and minimal disruptions.

In a scenario of tight deadlines, the test manager should prioritize testing critical functionalities with high risk first. This approach ensures that potential high-impact issues are addressed promptly, reducing the risk of critical failures during production deployment. This aligns with effective risk-based testing strategies to deliver a more robust and reliable software product within the given constraints.

Implementing account lockout policies is an immediate action to address the discovered vulnerability. This security measure helps prevent brute force attacks by temporarily locking user accounts after a certain number of failed login attempts. Ignoring the issue could expose the software to security risks, making prompt remediation essential during the security audit preparation phase.

Risk assessment involves identifying and prioritizing risks, while risk mitigation focuses on implementing strategies to reduce the impact of identified risks. In testing, understanding these concepts helps in developing effective risk management plans to ensure the quality of the software throughout the development lifecycle.

Data masking is a technique in test data management that involves disguising original data to protect sensitive information. It ensures data privacy and security during testing.