PCA (Prometheus Certified Associate) sample exam question with answer 100

Question:
Which of the following BEST describes the relationship between SLAs, SLOs and SLIs, where the item on the right hand side is a component of the item on the left hand side?

1. SLA > SLI > SLO
2. SLA > SLO > SLI
3. SLI > SLO > SLA
4. SLO > SLA > SLI

Answer:
B - is the correct answer.
A - is incorrect as SLOs are composed of SLIs. In order to define a goal for a level of service (SLO), we need to be able to measure the level of service (SLI).
C - the correct order is the reverse.
D - SLAs are broader than SLOs. An SLO defines a goal for an aspect of a service and the SLA establishes an agreement between parties for what happens when the goal is not met