Answer:
The correct answer is agile.
Explanation:
Agile software development methodologies are essential in a world in which things change at vertigo speed. The programmers live worried about what are the latest trends, which languages or practices are obsolete and with the constant sword of Damocles to think that what we are developing today may not help tomorrow.
The world of development, for better or for worse, has evolved from a model in which all phases were planned and carefully structured to a model in which development should be as fast and efficient as possible. Personally I am a big fan of agile software development methodologies, how many principles are stated in this manifesto.
