What is a key safety task in the retirement stage of a system's lifecycle?

The retirement stage of a system's lifecycle includes key safety tasks focused on ensuring that the system is decommissioned in a manner that poses no risk to safety or the environment. Safe disposal is paramount during this phase. This involves properly handling materials and components that may be hazardous or that could impact safety if not disposed of correctly.

Safe disposal plans must adhere to regulations and best practices to mitigate potential risks associated with the remnants of the system. This may involve recycling, transferring, or disposing of components in a way that prevents environmental contamination or any safety hazards to personnel involved in the disposal process.

The other options, while important in their respective contexts, do not align with the critical safety tasks specific to the retirement phase. Final user training typically occurs in the deployment or operational phases of a system, while production documentation review and testing after modifications are associated with the initial development and operational maintenance of the system rather than its retirement.