Northern Trail Outfitters is growing and acquiring other organizations, each with its own instance of Sales Cloud. They are debating whether to upgrade Marketing Cloud Connect to Multi-Org. What consideration could be provided to help with the decision?

A. Shared Salesforce Data Extensions will be enabled in up to 5 business units.

B. Custom profile and subscription centers will not be required.

C. Once an account is upgraded to Multi-Org, it cannot be turned off.

D. Existing accounts cannot be upgraded to Multi-Org.