What is the term for turning one cell into two or more smaller cells?

Given the following code, find the compile error.

``` public class Test { public static void main(String[] args) { m(new GraduateStudent()); m(new Student()); m(new Person()); m(new Object()); } public static void m(Student x) { System.out.println(x.toString()); } } class GraduateStudent extends Student { } class Student extends Person { @Override public String toString() { return "Student"; } } class Person extends Object { @Override public String toString() { return "Person"; } }``` a. m(new GraduateStudent()) causes an error b. m(new Student()) causes an error c. m(new Person()) causes an error d. m(new Object()) causes an error

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