The answer is C ms-dos
Side note:
GUI means graphical user interface. In other words, that means it looks pretty and has cool buttons, animations and cute stuff. MS-DOS is just a black screen with words on it. Definitely not cute or cool.
A workflow consists of an orchestrated and repeatable pattern of business activity enabled by the systematic organization of resources into processes that transform materials, provide services, or process information.
Create a detailed outline of what you want to achieve and sketch a workflow diagram before using workflow chart software or templates. This will help to ensure your chart is accurate and complete. Always consider your process and workflow manageability when inserting logic in your workflow chart. You can use decision symbols, connectors and text boxes. Always confirm the accuracy of your workflow chart with other stakeholders.
(If you need to know what the workflow diagrams layout is just look it up. GL.)
(IEEE) Is the obvious answer ; no harshness meant in any way
d- enjoy
b- national service !
