IN JAVA PROGRAMMING

The following code shows compile time error. Can you identify what's wrong with it?

class X

{

//Class X Members

}

class Y

{

//Class Y Members

}

class Z extends X, Y

{

//Class Z Members

}

choose the best:

1- In Java, a class can extend more than one class. Class Z is extending two classes - Class X and Class Y. There should be no compile time error.

2-Nothing wrong with this code.

3-There is no constructor defined.

4- In Java, a class can not extend more than one class. Class Z is extending two classes - Class X and Class Y. It is a compile time error in java.

I got confused and need explanation which would be the best answer