Effective Service Transition can significantly improve a service provider's ability to handle high volumes of what?

Service level requests are handled through Request Fulfilment within Service Operation, not through Service Transition.

Service Transition is the ITIL lifecycle stage responsible for building, testing, and deploying services and changes into the production environment. By providing rigorous Change Management, Release Management, and Deployment Management processes, effective Service Transition enables organizations to handle large volumes of changes and releases with minimal disruption. This capability is a stated key outcome and purpose of the Service Transition lifecycle stage.

Password resets are a type of service request managed through Request Fulfilment in Service Operation, not through Service Transition.

Incidents and Problems are managed within Service Operation via Incident Management and Problem Management respectively, not through Service Transition.