Given a site called RefArch with the settings shown, what must be done for RefArch...

B2C Commerce customer lists areorganization-level objects that can be assigned to multiple sites. Each individual site can use exactly one assigned customer list, but multiple sites can reference the same list. Salesforce documents this relationship explicitly.

To configure RefArch to use RefArchGlobal ' s customer list, the administrator edits the RefArch site configuration and selectsRefArchGlobalas its Customer List. Salesforce ' s storefront-site configuration documentation identifies Customer List as a configurable field on the site ' s General tab.

Importing the customer list into RefArch would create or transfer customer data rather than establish the intended shared-list assignment. It would not implement genuine shared customer profiles.

Option B is also incorrect because there is no generic " Customer List Sharing " global preference that enables this behavior. Sharing is accomplished by assigning the same customer list to more than one site.

Study Guide reference:B2C Commerce Setup — Customer Lists, shared customer profiles, multi-site configuration, site General settings, and customer-list assignment.

===============