Given the following code:

public class Rectangle $\{$

private double width;

private double height;

public Rectangle$($double newWidth, double newHeight$)$

$\{$

width $=$ newWidth;

height$=$ newHeight;

$\}$

$\}$

a$.$ You can still create objects using the default object constructor $($no$-$argument constuctor$)$

b$.$ You have only one object construction method

c$.$ You can never construct objects of the Rectangle class

d$.$ You have two object construction methods $($no$-$argument and the explicitly defined constructor$)$