PCA (Prometheus Certified Associate) sample exam question with answer 385

Question:
What is an exemplar?

1. A reference to some external data associated with a time series, commonly a trace
2. A reference to some external data associated with a log, commonly a trace
3. The time series with the maximum value for a metric
4. The time series with the minimum value for a metric

Answer:
A - is the correct answer. More at exemplars-experimental
B - is incorrect as an exemplar ties external data to a time series, not a log
C, D - is incorrect as an exemplar is designed to correlate an external type telemetry data with time series metrics. Typically this external data comes in the form of a trace ID