What is important to do when working with software development models?

What is important to do when working with software development models?
A . To adapt the models to the context of project and product characteristics.
B . To choose the waterfall model because it is the first and best proven model.
C . To start with the V-model and then move to either iterative or incremental models.
D . To only change the organization to fit the model and not vice versa.

Answer: A