PCA (Prometheus Certified Associate) sample exam question with answer 568

Question:
What is an SLA?

1. An agreement made between two or more parties about aspects of a service such as its availability
2. An availability metric
3. Any metric that describes some desirable aspect of a system
4. A goal regarding an aspect of a service such as its availability

Answer:
A - is the correct answer
B - is incorrect as an SLA is an agreement between parties about the level of service to be provided and consequences for not providing that level of service. While availability metrics are commonly used to measure the system's availability for use in an SLA, they themselves are not an SLA
C - is incorrect as this is the definition of a Service Level Indicator (SLI)
D - is incorrect as this is the definition of a Service Level Objective (SLO)