Which role is accountable for a specific service within an organization?

The Service Level Manager is responsible for negotiating and managing Service Level Agreements across services, not for being accountable for any single specific service.

The Business Relationship Manager manages the relationship and communication between the IT provider and business units or customers, not accountability for delivering a specific service.

In ITIL, the Service Owner is the single accountable role for a specific service, responsible for its initiation, transition, ongoing maintenance, and eventual retirement. The Service Owner acts as the primary point of accountability for that service, ensuring it meets agreed requirements and representing it in dealings with other processes and stakeholders.

The Service Continuity Manager is responsible for ensuring IT services can recover after a disaster, which is a specific process role rather than overall accountability for a service.