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mock question about exceptions...from K&B SCJP book

 
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chapter 5 page 390

3. Given:
import java.io.*;
class Master {
String doFileStuff() throws FileNotFoundException { return "a"; }
}
class Slave extends Master {
public static void main(String[] args) {
String s = null;
try { s = new Slave().doFileStuff();
} catch ( Exception x) {
s = "b"; }
System.out.println(s);
}
// insert code here
}

Which, inserted independently at // insert code here, will compile, and produce the output b? (Choose all that apply.)

A. String doFileStuff() { return "b"; }
B. String doFileStuff() throws IOException { return "b"; }
C. String doFileStuff(int x) throws IOException { return "b"; }
D. String doFileStuff() throws FileNotFoundException { return "b"; }
E. String doFileStuff() throws NumberFormatException { return "b"; }
F. String doFileStuff() throws NumberFormatException,
FileNotFoundException { return "b"; }


----------------------------------------------
A , D, E, and F are correct. It�s okay for an overriding method to throw the same exceptions, narrower exceptions, or no exceptions. And it�s okay for the overriding method to throw any runtime exceptions.

----> I thought we have to always throw the exception the super-method does, as described in the book?? this is really getting even more confusing!
 
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