PCA (Prometheus Certified Associate) sample exam question with answer 395

Question:
What does the following config do?

scrape_configs:
  - job_name: "demo"
    metric_relabel_configs:
      - regex: fstype
        action: labeldrop

1. All targets with the fstype label will not get scraped
2. The metric fstype will get dropped
3. The label fstype will be dropped for all metrics
4. The metric fstype will have all of its labels dropped

Answer:
C - correct answer