Why is the SDLC methodology typically referred to as $$the waterfall model$?$

Question $4$Select one:

a$.$

To stress the fact that phases are sequential, and iteration should be avoided as much as possible

b$.$

Both because it was first popularized in a town with many waterfalls and to show that getting good user requirements is important and there should be multiple opportunities to elicit user requirements

c$.$

Because it was first popularized in a town with many waterfalls

d$.$

To show that getting good user requirements is important and there should be multiple opportunities to elicit user requirements

e$.$

Because the SDLC$,$ like prototyping, is not iterative