Answer:
Service level agreement (SLA).
Explanation:
Service level agreement (SLA) is an agreement on particular baspects of service between a service provider and a client. It involves aspects such as quality, availability and responsibilities that will be binding on the service provider in this relationship.
There are 3 types of SLAs: service-based SLA, customer-based SLA, and multi-level SLA.
SLAs apart from defining expected service level, also includes measurements that is used to guage service, and penalties in case of breach.