Will give brainliest

what is an lms and how is it used?

software used in education to deliver online courses
an online repository used to save files on servers
a small portable computer operated by a touch screen
external hardware that store all types of files

Need asap write a short paper describing the history and differences between six sigma, waterfall, agile, and scrum models. understanding these models can give you a good idea of how diverse and interesting it development projects can be. describe what the rationale for them is and describe their key features. describe the history behind their development. at least 400 words