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.

$\backslash$table$[[$Student$],[-$name: string$],[-$id: int$],[+$student $($string name, int id$)$:$],[$void$]]$

public student $($string name, int id$)$

$\{$ this.name$=$name;

this.id$=$id;

$\}$

$\backslash$table$[[$Teacher$],[-$name: string$],[-$id: int$],[+$teacher $($string name, int id$)$:$],[$void$]]$

public teacher $($string name, int id$)$

$\{$

this.name$=$name;

this.id$=$id;

$\}$

$\backslash$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$)$;

$\}$

$1$