List at least eight classes that can be used in an online course registration system that allows students to add and drop classes at a university.

Consider the development of a computer system for car rentals. Name one class that might be useful in this context from each of the following categories:

(a) Tangible things

(b) Agents

(c) Events and transactions

(d) Users and roles

(e) Systems

(f) System interfaces and devices

(g) Foundational classes