Public class Book {
private String author;
private String title;
public Book(String the_author, String the_title)
{
author = the_author;
title = the_title;
}
}
public class Textbook extends Book
{
private String subject;
public Textbook(String the_author, String the_title, String the_subject)
{
/* missing implementation */
}
}

Which of the following can be used to replace /* missing implementation */ so that the Textbook constructor compiles without error?

a. author = the_author;
title = the_title;
subject = the_subject;

b. super(the_author, the_title);
super(the_subject);

c. subject = the_subject;
super(the_author, the_title);

d. super(the_author, the_title);
subject = the_subject;

e. super(the_author, the_title, the_subject);