Final answer:
The CAD system referred to in the question is used by emergency services to manage and dispatch resources to incidents, which is correctly described by option 1. This should not be confused with CADD, which involves designing and drafting with software.
Step-by-step explanation:
Computer-Aided Dispatch (CAD) systems are integral to emergency services for managing resources and responding to incidents efficiently. The correct statement about CAD systems is option 1: A system used by emergency services to manage and dispatch resources to incidents. CAD systems are not typically used for managing flight schedules, processing financial transactions, or tracking student attendance, which are functions pertaining to different types of software applications. In contrast, computer-aided design and drafting (CADD) is a practice involving the use of sophisticated software like CATIA and EPIC to create detailed representations of objects, ensuring designs are compatible and validated for buildability, as demonstrated during the construction of the first 777 aircraft. Moreover, engineers utilize CAD software to design and analyze complex systems such as electrical circuits, while architects benefit from CAD to produce realistic representations, 3D visualizations, and simulations without the need for physical models.