Which of the following abbreviations refers to a system for managing maintenance activities?

The abbreviation that refers to a system for managing maintenance activities is CMMS, which stands for Computerized Maintenance Management System. A CMMS is an essential tool used by organizations to streamline maintenance operations by organizing information, tracking work orders, scheduling preventive maintenance, and managing inventory. This system enhances operational efficiency by allowing maintenance teams to reduce downtime, improve asset longevity, and ensure compliance with regulatory standards.

Other abbreviations listed, like SCADA (Supervisory Control and Data Acquisition), are used for controlling and monitoring industrial processes rather than managing maintenance specifically. PPE stands for Personal Protective Equipment, which refers to gear used for personal safety in hazardous environments. SDS, or Safety Data Sheets, provide information about the properties of hazardous substances and how to handle them safely, but do not relate to the management of maintenance tasks. Thus, CMMS is clearly the correct choice when the context is managing maintenance activities.