A university wants to develop a software system to manage online courses, including registration, grading, and communication features. Develop a domain model by following the below steps:

$1.$ Identify key concepts: list the main entities involved in this system $($e$.$g$.,$ Student, Course, Professor, etc.$).$

$2.$ Describe attributes: for each entity, define its key attributes $($e$.$g$.,$ Student: name, ID$,$ major; Course: title, instructor, syllabus, etc.$).$

$3.$ Map relationships: identify the relationships between entities $($e$.$g$.,$ Student enrolls in Course; Professor teaches Course; etc.$).$ Specify the cardinality and optionality of each relationship $($e$.$g$.,$ one student can enroll in many courses, but a course can only have one professor$).$

$4.$ Define Constraints: what are the key constraints governing the system? $($e$.$g$.,$ a student cannot register for a course past the deadline; grades must be within a specific range$).$

$5.$ Model representation: create a domain model using Visual Paradigm. Note that domain models use the same notations as class diagrams. Hence, in Visual Paradigm, you will use the class diagram tool.

$6.$ Evolve: Starting from the domain model, create a UML class diagram Visual Paradigm that contains the data types of the attributes, and the operations in the classes.