To ensure a robust and comprehensive Real-Time Customer Profile, the data architect must select identities that guarantee record uniqueness while maximizing the ability to stitch data. In this scenario, since every customer has aCRM IDbut not every customer has anEmail ID, theCRM IDmust be designated as thePrimary Identity(Option A). In Adobe Experience Platform, the Primary Identity serves as the anchor for the profile fragment; if a field marked as the only primary identity is missing a value, the record cannot be ingested into the Profile Service. By selecting the CRM ID, the company ensures that 100% of their records are processed and accessible.

Furthermore, theEmail IDshould be treated as aSecondary Identity(Option C). In XDM, you can mark multiple fields as identities. When Email ID is included as an identity in the schema—even if it is not the primary—it still participates in theIdentity Graph. This allows the platform to "stitch" together profile fragments from other sources (like web behavior or email marketing logs) that might only contain the Email ID.

Option D is incorrect because records without an email (like "Sarah Doe" in the provided image) would fail to load. Option E is technically incorrect because XDM does not support "co-primary" status in a single schema; one must be the primary anchor. By using CRM ID as the primary and Email ID as a secondary identity, the system creates a "Single View of the Customer" that is both complete (no dropped records) and extensible (linkable via email when available).