These answers are correct because they are ways to model a customer across all three systems using the Marketing Cloud Subscriber Key and Service Cloud as sources of truth. The Marketing Cloud Subscriber Key can be sent to Service Cloud and B2C Commerce to be held for reference, which can help link customer records across systems and enable cross-channel marketing and service. Service Cloud can be used as system of record for customer data and consent preferences across all channels, which can help comply with data privacy laws and provide a consistent customer experience. Reference: https://help.salesforce.com/s/articleView?id=sf.mc_co_marketing_cloud_connect_best_practices.htm&type=5 https://help.salesforce.com/s/articleView?id=sf.b2c_commerce_service_cloud_integration.htm&type=5