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To verify the non-functional requirements such as the support for a minimum number of enquiries per hour, availability, and response time during peak loads, the most appropriate set of test types would include Performance Testing to assess the responsiveness and stability, Load Testing to verify the system's ability to handle expected user loads, and Stress Testing to determine the system's behavior under extreme conditions. These tests collectively ensure that the system meets the specified non-functional criteria.

Statement testing is a structure-based (white box) testing technique. It involves executing all the executable statements in the code at least once. This technique requires knowledge of the internal structure of the code, making it a white box testing method.

An effective incident report should provide a clear and detailed description of the issue, including the title, reproducibility, a detailed description of the failure, and any relevant references to specifications. This helps in accurately identifying, reproducing, and resolving the defect. In this case, including the specific reference to the PID and a screenshot helps provide all necessary information for resolving the issue.

A valid objective of testing is to prevent defects. While correcting defects and locating defects in the code are part of the testing process, the primary goal is often to prevent defects by identifying issues early in the development cycle and improving the overall quality of the software. Ensuring no defects are present is an unrealistic objective, as testing can demonstrate the presence of defects but not their absence.