After completing a third-party assessment, it is crucial to hold an internal review meeting before engaging the vendor. The primary stakeholder in this meeting is the internal business relationship owner. This individual or team owns the relationship with the vendor, understands the business context and criticality of the service, and is ultimately responsible for the risk associated with the engagement. Their approval and alignment on the severity of findings and proposed remediation plans are essential to ensure that the subsequent conversation with the vendor is unified, consistent, and focused on the organization's specific risk appetite and business needs.

A) The third party's Chief Information Security Officer: Engaging the vendor's CISO is a step that occurs after the internal team has aligned on the findings and required actions.

C) The external auditors: External auditors may review the TPRM process, but they are not involved in the operational step of approving specific vendor remediation plans.

D) The third party's account manager: This is a vendor representative. All discussions with the vendor should happen only after the internal strategy and requirements are finalized.

1. The Shared Assessments Program. (2019). Third Party Risk Management Blueprint. This guide outlines the TPRM lifecycle, emphasizing the role of the business/line of business (LOB) owner in risk identification, assessment, and ongoing monitoring phases. The "Remediation & Ongoing Monitoring" phase requires LOB involvement to validate that risks are addressed according to business requirements.

2. NIST. (2021). Special Publication 800-161 Rev. 1: Supply Chain Risk Management Practices for Federal Information Systems and Organizations. Section 2.3.2 discusses establishing roles and responsibilities, highlighting that the "mission or business owner" is a key participant in managing supply chain risks.