Within ServiceNow CMDB governance, Attestation and Data Certification serve distinct but complementary purposes. The key difference lies in what is being validated.

Attestation is focused on existence and ownership confirmation. When a CI is attested, the assigned user or group is asked to confirm that the CI still exists, is still relevant, and is still owned or managed by the appropriate team. No detailed attribute-level validation is required. This lightweight process is commonly used to prevent “ghost CIs” from lingering in the CMDB.

Data Certification, on the other hand, is more rigorous. It requires the certifier to validate specific attributes of the CI, such as lifecycle status, support group, environment, or service relationships. Certification ensures data correctness and completeness, which directly impacts CMDB Health scores and downstream processes like Change and Incident Management.

Options A, B, and C incorrectly describe these mechanisms or their assignment and scheduling capabilities. Both attestation and certification can be scheduled and assigned flexibly, but their validation depth is what truly differentiates them.

Therefore, Option D correctly describes the distinction: attestation confirms existence, while data certification validates CI attributes.