Which entities must be migrated and in which sequence to accomplish the migration?

Universal containers (UC) is a communication service provider using commination cloud. UC plans to migrate their B2C customer and their customer services into communication cloud. UC have configured the products in the Enterprise product catalog.

Which entities must be migrated and in which sequence to accomplish the migration?
A . User, Contacts, Consumer Account, Billing Account, Service Account, Subscriptions, Assets
B . Users, Consumer Account, Billing Account, Service Account, Contacts, Assets
C . User, Consumer Account, Billing Account, Service Account, Contacts, Assets Line Items, Assets
D . User, Person Account, Billing Account, Service Account, Contacts, Assets.

Answer: A