The correct option is Agile.

Agile emphasizes short iterations and frequent releases so teams can deliver new features and fix defects quickly. It relies on close collaboration with stakeholders and regular feedback loops which let priorities shift and improvements be delivered rapidly. Continuous integration and automated testing commonly accompany this approach which reduces the time between finding and resolving defects.

Iterative uses repeated cycles of development, but it does not necessarily include the full set of practices such as continuous stakeholder collaboration and rapid release cadences that characterize Agile.

Waterfall is a linear, sequential model with requirements defined up front and final delivery at the end which makes it unsuitable for fast, frequent updates or rapid defect resolution.

DevOps focuses on automating deployment pipelines and improving collaboration between development and operations. It complements Agile by speeding delivery and operations, but it is not itself the core software development methodology that specifies iterative planning, sprinting, and stakeholder feedback which are the hallmarks of Agile.

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