PCA (Prometheus Certified Associate) sample exam question with answer 229

Question:
Which of the following descriptions would be appropriate for use as an SLI?

1. We aim for our service to maintain at least 99.9% availability on a 28 day rolling window
2. We aim for our service to maintain at least 99.9% availability on a 28 day rolling window. We agree to pay each customer $100 for each day in a month where we fail to meet the above availability
3. If we breach our SLO, we will dedicate the next three weeks to focus on stability of our service
4. We define availability as the number of HTTP requests our service handles successfully (non-5xx status) divided by the total number of requests to our service, multiplied by 100

Answer:
D - correct
A, B - this describes a Service Level Objective (SLO)
C - is incorrect as this describes a Service Level Objective (SLA)