What does the code in column a do and what type does it return?

aStudent.getName$()$;

Course OODP $=$ new Course$("$OODP$"$ "Object Oriented

Programming and Design"$)$;

OODP.addStudent$($aStudent$)$;

OODP.addStudent$($anotherStudent$)$;

OODP.addStudent$($LastStudent$)$;

OODP.numberOfStudents$()$;

OODP.getStudentAt$(2)$;

OODP.getStudentAt$(2).$getName$()$;

OODP.getStudentAt$(2).$getName$().$charAt$(0)$;