Which two point should an Architect consider in this situation?

Universal Containers (UC) operates worldwide with offices in more than 100 regions in 10 different countries role hierarchy to control data visibility. In the new fiscal year, UC is planned to reorganize the roles and reassign accounts owners.

Which two point should an Architect consider in this situation? Choose 2 answers
A . Using a temporary parking lot account to improve performance.
B. Changing complex role hierarchy can cause a high level of sharing recalculation.
C. Restricting the organization-sharing configurations to private.
D. Replacing Account records ownerships massively can cause data skew.

Answer: B,D