Calling a Superclass Constructor

Consider the following class definitions.

public class Rectangle
{
    private int height;
    private int width;

    public Rectangle()
    {
        height = 1;
        width = 1;
    }

    public Rectangle(int x)
    {
        height = x;
        width = x;
    }

    public Rectangle(int h, int w)
    {
        height = h;
        width = w;
    }
    // There may be methods that are not shown.
}

public class Square extends Rectangle
{
    public Square(int x)
    {
        /* missing code */
    }
}

Which code segment can replace /* missing code */ in the Square constructor to initialize the inherited instance variables height and width to the value of x?