$2\mathrm{.}2$ Richfield University has asked you to redesign their database into a relational database. They have given you the following business rules: Students at the university are either undergraduate or postgraduate. A student can also be an employee. Employees can be an academic or administrator. An academic can be a lecturer or researcher or both. A lecturer can either be a junior or senior lecturer. An administrator can be a manager or assistant. A manager must be a general manager or department manager. List all the entities for this EERD. Indicate notation as well. Please note, the only attributes you should indicate are Stud$\_$Num and Emp$\_$Num. Use relational schema e$.$g$.$ "Entity Name" $($Attribute$)\{$Notation$\}(20)$