In CMDB governance, different CMDB Data Manager policy types serve different validation and enforcement purposes. When the objective is to allow an assigned individual to review and update specific fields on a CI record, the correct policy type is Certification.

A Certification policy creates actionable tasks that require the assignee to validate and, if necessary, correct specific CI attributes, such as lifecycle status, support group, environment, or ownership. During certification, the user can directly update CI fields to bring the record into compliance with defined standards.

Attestation (Option C) only asks the user to confirm that a CI still exists or is still valid; it does not require or enable attribute-level updates. Audit (Option A) is used for reporting and evidence collection, not remediation. Compliance (Option D) measures adherence to rules but does not itself generate editable remediation tasks.

Certification is therefore the primary mechanism used when human validation and correction of CI data is required—making it a cornerstone of CMDB data quality management.

Hence, the correct answer is B – Certification.