Final answer:
The correct answer is All of the above. The CAD system, GIS, and AVL system present the estimated real-time locations of emergency response units. They work together to provide accurate and up-to-date information for efficient emergency response.
Step-by-step explanation:
The correct answer is All of the above. The computer-aided dispatch (CAD) system, geographic information system (GIS), and automatic vehicle location (AVL) system all present the estimated real-time locations of emergency response units within the telecommunicator's service area.
The CAD system is used to manage and track emergency calls and dispatch appropriate units. The GIS system provides spatial data and allows for mapping and visualization of emergency response units' locations. The AVL system uses GPS technology to track the exact location of emergency vehicles in real-time.
All these systems work together to provide accurate and up-to-date information to telecommunicators for efficient emergency response.