PCA (Prometheus Certified Associate) sample exam question with answer 202

Question:
What is the definition of an event?

1. An occurrence of something
2. An occurrence of an error
3. A textual representation of an occurrence, commonly structured with key-value pairs
4. A numeric measurement

Answer:
A - is the correct answer
B - is incorrect as an event can be an occurrence of anything, not just an error
C - this is the definition of a log
D - this is the definition of a metric