PCA (Prometheus Certified Associate) sample exam question with answer 228

Question:
What is the difference between a histogram and a summary metric?

1. Histogram metric quantiles are calculated server-side while summary quantiles are calculated client-side
2. Summary is not a type of metric while histogram is a valid type
3. Summary metric quantiles are calculated server-side while histogram quantiles are calculated client-side
4. Histogram is not a type of metric while summary is a valid type

Answer:
A - correct
B, D - histogram and summary are a type of Prometheus metric
C - is incorrect as these descriptions are reversed