PCA (Prometheus Certified Associate) sample exam question with answer 175

Question:
Which of the following is not a valid method for reloading alertmanager configuration?

1. send a SIGHUP signal to alertmanager process
2. hit the reload config button in alertmanager web-ui
3. HTTP post to /-/reload endpoint
4. restart alertmanager process

Answer:
B - there is no reload config button in web-ui