What tree security is applied to this user within SAP Successfactors Workforce Analytics?

SAP SuccessFactors role-based permissions for SAP Successfactors Workforce Analytics have been enabled and a user is granted multiple roles. Each role assigned to this user has a unique tree security set up.

What tree security is applied to this user within SAP Successfactors Workforce Analytics? Please choose the correct answer.
A . The role with the least complex tree security
B. The union of all tree security from each role
C. The role with the most complex tree security
D. The user’s primary role tree security

Answer: D