The lifecycle sequence represented by the course question is Design, Develop, Test, Deploy . These stages describe the fundamental progression required to transform a detection concept into operational security content.
During Design , engineers define the threat behavior, telemetry requirements, analytic objective, expected entities, false-positive considerations, and desired analyst outcome. Develop converts those requirements into SPL, correlation-search logic, risk logic, annotations, and appropriate output fields. Test validates the detection against representative telemetry, historical events, simulations, or controlled attack activity and evaluates both positive detection behavior and false-positive conditions. Deploy moves the validated analytic into the operational environment with the proper schedule, permissions, response configuration, and monitoring expectations.
Documentation, research, monitoring, and maintenance are important supporting practices, but the question asks for the lifecycle elements represented by the DDLC formulation used here. Option D provides the coherent ordered core development sequence; the other choices omit essential stages or place activities in combinations that do not reflect the expected lifecycle.
Study Guide topics: Detection Development Lifecycle, design, SPL development, testing, validation, deployment, detection engineering governance.
