Design walk-through is the method done while designing codes through which assurance regarding validity and accuracy of design is evaluated.
Reviewing of codes design ,content ,GUI(Graphical user interface) design and production processing components are done at this stage.This steps gives the surety about all the decision and features are correct and quality is maintained.
Other options are incorrect because unit walk-through is reviewing the complete unit or system.Testing walk-through and user walk-through are not the technical term of engineering field.
