Please answer the following question.

Giving reasons for your answer. Suggest the best software development method that might be used in developing the following systems.

1) A large, complicated mission critical enterprise resource planning system.

2) The department of finanace in the Irish gov wants to deploy a new public finance system. The project needs a strict control and has a predictable budget and timeline.

3) A travel planning system that needs to be quickly developed and where the developers have access to tools that use automated code generating functionality.

4) An interactive gaming system where the requirements are constantly changing.