PCA (Prometheus Certified Associate) sample exam question with answer 133

Question:
Analyze the example alertmanager configs and determine when an alert with the following labels arrives on alertmanager, what receiver will it send the alert to team: backend and severity: critical

route:
  receiver: general-email
  routes:
    - receiver: frontend-email
      matchers:
        - team: frontend
      routes:
        - matchers:
            severity: critical
          receiver: frontend-pager
    - receiver: backend-email
      matchers:
        - team: backend
      routes:
        - matchers:
            severity: critical
          receiver: backend-pager
    - receiver: auth-email
      matchers:
        - team: auth
      routes:
        - matchers:
            severity: critical
          receiver: auth-pager
  receiver: auth-pager

1. backend
2. general-email
3. frontend-pager
4. backend-pager
5. backend-email

Answer:
D - backend-pager if you look carefully in above config