Which statement is correct about the diagram fragment?

Consider the following diagram fragment:

Which statement is correct about the diagram fragment?
A . The diagram fragment is a valid UML diagram.
B . To use the template List. Company must be a bound element to List.
C . List cannot be used by Company unless Company is also a template.
D . List cannot be used as a data type, only a bound element to List can.

View Answer

Answer: D

Explanation:

The provided diagram fragment seems to indicate a situation involving a template. In UML, a template is a parameterizable element, and a bound element is a specific manifestation of that template wherein the parameters have been replaced with actual values or types. If ‘List’ is a template class, it cannot be directly used as a type. Instead, one must use a bound element of the List, meaning the template parameters of List must be bound to actual types before it can be used. For instance, if List is a template expecting a type T, then a concrete class might be List<Customer> or List<Order>, where Customer or Order are actual types replacing the template parameter T. This use of templates and bound elements is according to the UML specification, which details how templates are defined and instantiated within UML models.