Multiple Choice

Look at the following code. Which line will cause a compiler error?

Line 1 public class ClassA

Line 2 {

Line 3 public ClassA() {}

Line 4 public final int method1(int a){}

Line 5 public double method2(int b){}

Line 6 }

Line 7 public ClassB extends ClassA

Line 8 {

Line 9 public ClassB(){}

Line 10 public int method1(int b){}

Line 11 public double method2(double c){}

Line 12 }

* 4

* 5

* 10

* 11