Which of the following is NOT true about UML? Select one: O a. UML class diagram can be used for specifying a domain model. O b. UML use case diagram is used to identify use cases and their relations to actors. O c. UML system sequence diagram describes the internal behaviors of the system under development. O d. UML class diagram is used to specify the class structure of a system. O e. UML is a standard notation for modeling an object-oriented system