Which of the following statements are true about the Waterfall model in software development?

The Waterfall model is a sequential design process, often used in software development processes, where progress is seen as flowing steadily downwards through phases like Conception, Initiation, Analysis, Design, Construction, Testing, and Maintenance.

The Waterfall model allows revisiting previous phases if changes are needed.

It is best suited for projects where requirements are well understood and unlikely to change.

The Waterfall model is highly flexible and can easily adapt to changes during the development process.