Final answer:
The Service Level Agreement (SLA) outlines performance requirements for a vendor.
Step-by-step explanation:
The agreement that outlines performance requirements for a vendor is the Service Level Agreement (SLA).
An SLA is a formal document that establishes the expected level of service between a vendor and a client. It specifies the metrics, responsibilities, and performance expectations that the vendor must meet.
For example, the SLA may define the vendor's response time, resolution time, availability, and other key performance indicators.