A business analyst (BA) is preparing a requirement package for access management system. A state diagram foe entity 'User* has been prepared. The BA wants to check the completeness of requirements…

A sequence diagram shows time-ordered message exchanges between objects for a specific scenario and does not provide a role-based mapping of all system functions needed to validate state completeness.

A functional diagram is not a standard UML modeling artifact and does not provide the role-to-function mapping necessary to cross-check state transitions for different user roles.

A use case diagram shows interactions between actors (including different user roles) and system functions, which directly corresponds to the behavioral states in a state diagram. Cross-referencing the two models allows the BA to confirm that every state and transition of the 'User' entity has a defined function and that all role-based interactions are accounted for. This pairing is a standard technique for verifying requirements completeness through model comparison.

A data flow diagram illustrates how data moves through a system and does not represent actor roles or functional interactions that can be matched against entity state transitions.