End-to-End Testing involves testing an application's flow as a whole to ensure that the entire process of a user accessing and using the site works smoothly. In this scenario, the entire shopping process, from product selection to payment and receiving a confirmation, is being tested, making it a classic case of End-to-End Testing.

While both a security audit and vulnerability scan aim to identify vulnerabilities, a security audit is a more comprehensive review of an organization's entire information system, including policies, procedures, and controls. On the other hand, a vulnerability scan focuses on identifying technical vulnerabilities.

Vulnerability Scanning is a systematic approach that uses specialized tools to identify, rank, and report potential vulnerabilities in a computer system or network. It provides an overview of the security flaws but doesn't necessarily exploit them like penetration testing.

JMeter is a popular open-source tool primarily used for performance testing. It allows testers to simulate multiple users and test how much load an app can handle, ensuring the app performs well under heavy usage. While it started for web applications, it is now used for mobile application load testing as well.

The "Retesting" phase in the bug life cycle is when a specific defect or bug has been fixed and is tested to ensure its rectification. It's a verification process to confirm that the particular defect has been successfully addressed.

Incremental Integration testing involves testing parts of a system sequentially as they're developed. In environments where multiple teams work on different components, this approach ensures that each new piece integrates smoothly with the existing parts, helping detect issues early and reducing integration risks.

A Walkthrough is a type of review where the author leads members of the review through the document based on their understanding. It's informal in nature and often relies on scenarios to provide the reviewers with a deeper understanding. The main goal is to gather feedback and achieve a common understanding.

Configuration Auditing is a critical aspect of Configuration Management. It involves the process of evaluating and examining the configurations to ensure that they align with the approved configuration documentation. Through this, unauthorized changes, discrepancies, or inconsistencies can be detected and addressed promptly.

Requirement-based Testing, as the name implies, involves designing test cases directly based on the system requirements. It ensures that the software system meets and conforms to the specified requirements, making certain that all functionalities are tested as intended.

If a defect is considered not genuine or if it's not a real issue, it is typically marked as "Rejected." This status indicates that the defect raised is either not replicable, is intended behavior, or isn't valid in the context it was reported.