Given:

public class SampleClass {

public static void main(String[] args){

AnotherSampleClass asc = new AnotherSampleClass();

SampleClass sc = new SampleClass();

//TODO code application logic here

}

}

class AnotherSampleClass extends SampleClass{

}

Which statement, when inserted into line "//TODO code application logic here", is valid change?

a. asc =sc;

b. sc = asc

c. asc = (object) sc;

d. asc = sc.clone();

Please explain your answer.