Explanation
A help desk is considered to be focused on break-fix (what ITIL calls incident management), whereas a service desk is there to assist with not only break-fix but also with service requests (requests for new services) and requests for information (such as "how do I do X?").
https://www.atlassian.com/itsm/service-request-management/help-desk-vs-service-desk-vs-itsm#:~:text=A%20h

Partners and suppliers are one of the four dimensions of service management that influence the effectiveness and efficiency of service delivery1. This dimension covers the relationships that an organization has with other organizations that are involved in the design, development, deployment, delivery, support, and improvement of services2. This dimension also includes the contracts, agreements, and policies that govern these relationships3. Reference: ITIL Foundation - ITIL 4 Edition, page 8; ITIL 4 - A Pocket Guide, page 19; ITIL 4 Practice Guide: Partner and Supplier Management, page 7.

Costs are the amount of money spent on a specific activity or resource. From the service consumer's perspective, there are two types of cost involved in service relationships:
Costs removed from the consumer by the service (a part of the value proposition). For example, for a car sharing service, the customer does not pay for the actual cost of purchasing the car.
https://www.bmc.com/blogs/itil-key-concepts-service-management/