Final answer:
Supervisors at an incident are required to maintain a daily log, which serves as a record of personnel and activities. This is essential for effective incident management, ensuring accountability, and historical documentation of the incident's operations.
Step-by-step explanation:
All supervisors at an incident must maintain a daily log, which contains the names of assigned personnel and operational shift activities. The correct answer is B) Log. A daily log is a critical tool in incident management as it ensures continuity across shifts, accountability, and provides a historical record of decisions and actions taken during an incident.
Logs are typically used in various fields that require tracking of daily activities, including emergency management, project management, and business operations. These logs help in coordinating efforts, evaluating performance, and making strategic decisions based on the recorded information.