https://preparationpoint.info/solved-past-papers-mcqs/ppsc-past-papers/ppsc-past-papers-2018/model-paper-65-excise-taxation-inspector-bs-16-2018-region/in-a-computer-systems-_______-work-in-the-similar-fashion-as-files-in-folders-are-physically-maintained-in-real-word-offices/