A retail company currently uses B2C Commerce, Service Cloud, and Marketing Cloud. The company plans to launch a winter sweepstakes campaign to attract new customers. The signup page is hosted on B2C Commerce and collects new customer details like name, phone number, and email. In order to enter the sweepstakes, the customer must sign up to receive marketing communications. In return, they will receive a coupon for 20% off their next purchase.
Which option should be defined as the data source authority for the customer attributes collected from the sweepstakes page?