To answer this question, you need to understand the concept of coupling in software engineering. Coupling refers to the degree of interdependence between modules or components in a system. Low coupling means that the modules or components are loosely connected and have minimal dependencies on each other.
Let's go through each option to understand why it is correct or incorrect:
Option A) The attributes of the class are all private - This option does not indicate low coupling. The visibility of attributes does not necessarily determine the level of coupling.
Option B) The class refers to a small number of other objects - This option indicates low coupling. When a class refers to a small number of other objects, it suggests that it has minimal dependencies on other components.
Option C) The object contains only a small number of variables - This option does not directly indicate low coupling. The number of variables in an object does not necessarily determine the level of coupling.
Option D) The object is referred to using an anonymous variable, not directly - This option does not indicate low coupling. The way an object is referred to does not directly affect the level of coupling.
Option E) The reference variable is declared for an interface type, not a class. The interface provides a small number of methods - This option indicates low coupling. Declaring a reference variable for an interface type and having the interface provide a small number of methods suggests loose coupling between the components.
The correct answer is Option E. This option is correct because it indicates a situation with low coupling, where the reference variable is declared for an interface type, and the interface provides a small number of methods.