Suppose you create a class Square to be a subclass of GeometricObject. Analyze the following code:

```
class Square extends GeometricObject {
double length;

Square(double length) {
GeometricObject(length);
}
}
```
a. The program compiles fine, but you cannot create an instance of Square because the constructor does not specify the length of the Square.
b. The program has a compile error because you attempted to invoke the GeometricObject class's constructor illegally.
c. The program compiles fine, but it has a runtime error because of invoking the Square class's constructor illegally.

b. The program has a compile error because you attempted to invoke the GeometricObject class's constructor illegally.