Which of the following are valid test objectives?

The reason why the first selection is considered a valid set of test objectives is that it encompasses a comprehensive view of what software testing aims to achieve.

Finding defects is a fundamental goal of testing, as it involves identifying errors and issues within the software that need to be resolved before the product is released. This is crucial for ensuring the software meets specified requirements and functions correctly under various conditions.

Gaining confidence about quality refers to the testers' ability to assure stakeholders that the product is reliable and meets quality standards. This aspect is vital for decision-making processes regarding release readiness.

Preventing defects is an objective that emphasizes early detection and resolution of issues during the development process, which can significantly reduce the cost and time associated with fixing defects later on. This proactive approach to testing aligns with quality assurance principles and helps in developing better software overall.

The combination of these three objectives illustrates a well-rounded approach to software testing that aligns with industry best practices.