PCA (Prometheus Certified Associate) sample exam question with answer 365

Question:
What does the following config do?

scrape_configs:
 - job_name: example
   relabel_configs:
    - source_labels: [env, team]
      regex: dev;marketing
      action: drop

1. drops all targets with env and team labels
2. sets the env and team label on all targets for this job
3. scrapes all targets with env and team labels
4. drops all targets whose env label is set to dev and team label is set to marketing

Answer:
D - correct answer