Two stakeholders are arguing over which model to use for requirements.

Comprehensive and Detailed Explanation:Activity diagrams and state diagrams serve different purposesand can be used together to provide acomprehensive understanding of system behavior.

BABOK® Guide (Chapter 10.5 - Process Modeling and Chapter 10.8 - State Modeling)states thatactivity diagrams describe workflows, while state diagrams describe system states, making them complementary rather than competing models.

A fusion model (Option A)may not always be practical or necessary.

Allowing both models to be used independently (Option C)may lead to inconsistency.

Introducing a third model (Option D)does not address the existing disagreement.