Which of the following statements are true regarding software development processes? $($Select all that are true$)$

Group of answer choices

The waterfall model is named because it is difficult to go to previous stages once you have moved to the next stage $($e$.$g$.,$ After implementation it is difficult to return to the Design phase$)$

The Iterative and incremental model is less flexible than the Waterfall model

Both the Waterfall and Iterative and Incremental models end with the maintenance phase

Gathering requirements are only important in the Waterfall model