PCA (Prometheus Certified Associate) sample exam question with answer 374

Question:
Analyze alertmanager configs below. Based off the following alert which receiver will receive the notification

alertname: node_filesystem_full
labels:
  team: frontend
  notification: pager

route:
  receiver: general-email
  group_by: [alertname]
  routes:
    - receiver: frontend-email
      matchers:
        - team: frontend
      routes:
        - matchers:
            notification: pager
          receiver: frontend-pager
    - receiver: backend-email
      matchers:
        - team: backend
    - receiver: auth-email
      matchers:
        - team: auth

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

Answer:
A - correct answer