During white box testing, which of the following statements is true?

In white box testing, the key focus is on assessing the internal workings of a software application. Therefore, the statement asserting that the tester knows the internal structure of the design is true. This type of testing requires a comprehensive understanding of the code, architecture, and infrastructure of the system being evaluated. By having access to this internal information, the tester can create tests that cover various paths, branches, and potential edge cases within the application, leading to a more thorough and accurate detection of bugs or vulnerabilities.

This internal perspective allows testers to use techniques like code coverage analysis, which helps ensure that all code paths are executed during testing, thus improving the overall reliability and quality of the software.