Which statement about UML class diagrams is true?

A) UML class diagrams can be used to summarize a class's attributes and operations.

B) In the UML, each class is modeled in a class diagram as a rectangle with three compartments.

C) The top compartment contains the class name centered horizontally in boldface type and the middle compartment contains the class's attribute names, which correspond to the data members of a class.

D) All of the above are true.