Please review image Identify the object$-$oriented principle applied in this code.

public class Customer $\{$

private String name;

private int age;

$//$ Constructors and other methods

public String getName$()\{$

return name;

$\}$

public int getAge$()\{$

return age;

$\}$

$\}$

a$.$ Classes are about behavior and functionality.

b$.$ Code to an interface rather than to an implementation.

c$.$ Each class in your application should have only one reason to change.

d$.$ Encapsulate what varies.

e$.$ None