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Consider the following UML and the corresponding suggested implementation. Find all the coupling between classes; make sure to identify the type of the coupling. Redesign

Consider the following UML and the corresponding suggested implementation.
Find all the coupling between classes; make sure to identify the type of the coupling.
Redesign the model in order to decrease the coupling as much as possible.
\table[[Student],[-name: string],[-id: int],[+student (string name, int id):],[void]]
public student (string name, int id)
{ this.name=name;
this.id=id;
}
\table[[Teacher],[-name: string],[-id: int],[+teacher (string name, int id):],[void]]
public teacher (string name, int id)
{
this.name=name;
this.id=id;
}
\table[[Course],[tadd (string name, int id,],[Boolean x): void],[],[]]
public add (string name, int id, Boolean x)
{
controller c= new controller ();
if (x)
{
Student s-new student (name, id);
c.addStudent(s);
}
else
{
Teacher t= new teacher (name, id);
c.addTeacher(t);
}
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