A. The client cannot move form a two-tier multiple assignment to two-tier single contract and single assignment after implementation.

B. If employees exists within the enterprise and legal employer the person model setting changed as there are not contract options that support a contract with multiple assignment.

C. The client change from any two-tier option to another at any point of time, irrespective of the existence of work relationships.

D. The client can have both: a two-tier multiple assignment employment model can remain for its existing employees, and a two-tier multiple contracts single assignment can be created to hire new employees with the same legal employer.