Mary has been part of OU group A and was recently added to OU group B. Which statement about her competency model association is true?

The correct choice regarding Mary's competency model association is that she will retain both competency model associations. When an individual belongs to multiple organizational units (OUs), they typically maintain the competency models associated with each of those units. This allows for a more nuanced understanding of their skills and competencies as they pertain to different roles and departments within the organization.

In this case, since Mary is part of both OU group A and OU group B, she would not lose the association with OU group A's competency model when she is added to OU group B. Instead, she would have access to and be associated with the competency models relevant to both groups, benefiting from a broader range of competencies that can enhance her performance and development within the organization.