Which of the following statements about test cases is true?

The statement indicating that test cases are derived from test conditions is true. Test conditions represent specific aspects of the software that need to be tested to ensure that it meets the requirements and functions as intended. These conditions are identified during the test planning and analysis phases, and the test cases are then crafted based on them to ensure that each condition is adequately addressed.

This approach ensures that the test cases are aligned with the system's requirements, facilitating comprehensive testing coverage. By deriving test cases from established conditions, testers can better ensure that they evaluate all necessary functionality and can help identify defects early in the development process.

In contrast, the other statements do not accurately reflect the nature of test cases. For example, while coding standards may inform some aspects of testing, they are not the basis for creating test cases. Test cases cannot guarantee successful testing as they are merely a part of the overall testing strategy and implementation; they help identify defects, but success relies on various factors, including test execution, environment, and test design. Additionally, test cases can be developed in parallel with coding activities, not exclusively after coding is complete, thus supporting an iterative and agile development process.