PCA (Prometheus Certified Associate) sample exam question with answer 93

Question:
What is the difference between alert labels and annotations?

1. Alert labels should be used for metadata that uniquely identifies an alert while annotations should be used for longer-form descriptive content about an alert
2. Alert annotations can be used for silencing alerts while labels cannot
3. Alert annotations should be used for metadata that uniquely identifies an alert while labels should be used for longer-form descriptive content about an alert
4. Alert annotations can be used for routing while labels cannot

Answer:
A - check defining alerting rules
Actually labels that are used for routing and silencing while annotations are not