Explanation/Reference:
Explanation:
Bottom Up Testing is an approach to integrated testing where the lowest level components are tested first, then used to facilitate the testing of higher level components. The process is repeated until the component at the top of the hierarchy is tested.
With Bottom Up Testing critical modules can be tested first and the main advantage of this approach is that bugs are more easily found.
All the bottom or low-level modules, procedures or functions are integrated and then tested. After the integration testing of lower level integrated modules, the next level of modules will be formed and can be used for integration testing. This approach is helpful only when all or most of the modules of the same development level are ready. This method also helps to determine the levels of software developed and makes it easier to report testing progress in the form of a percentage.
Incorrect Answers:
A: Interface modules are located at higher levels of the software design, not at the bottom levels.
C: The major advantage of the top-down approach is that bugs are found earlier, not that confidence is achieved earlier.
D: The major functions are not located at the bottom, and would not be tested earlier.
References:
https://en.wikipedia.org/wiki/Integration_testing#Top-down_and_Bottom-up