A salesperson needs to know which subscription a customer has subscribed to or unsubscribed from...

B. Creating a custom preference center that updates the records in Sales Cloud can help meet the requirements by allowing customers to manage their subscription preferences and opt-in or opt-out of different email lists or publications. This can also provide more granular control over the data synchronization between Sales Cloud and Marketing Cloud. D. Implementing the Marketing Cloud Connector can help meet the requirements by enabling bi-directional data integration between Sales Cloud and Marketing Cloud. This can also allow Marketing Cloud to honor the unsubscribe status of contacts or leads in Sales Cloud when sending emails. References:

https://help.salesforce.com/s/articleView?id=sf.mc_co_implement_marketing_cloud_connect.htm &type=5

https://help.salesforce.com/s/articleView?id=sf.mc_co_unsubscribes_and_subscribers.htm &type=5

https://help.salesforce.com/s/articleView?id=sf.mc_co_create_a_custom_profile_center.htm &type=5