Which two tactics should a Solution Architect recommend to model a customer across all three systems?

A company wants to Implement B2C Commerce and Service Cloud and connect the systems with their existing Instance of Marketing Cloud.

Which two tactics should a Solution Architect recommend to model a customer across all three systems? Choose 2 answers
A . Migrate the Subscriber Key in Marketing Cloud to be the Service Cloud Contact or Person Account I
C . Use Customer 360 Data Manager to assign the Global Party ID and use it as a primary key across all systems including the new Subscriber ID in Marketing Cloud.
D . Using Service Cloud as a central point hold unique identifiers from all systems including the Service Cloud Contact or Person Account ID and B2C Commerce CustomerNo and Customer ID
E . Send the Marketing Cloud Subscriber Key to Service Cloud and B2C Commerce to be held for reference.

Answer: A,C