PCA (Prometheus Certified Associate) sample exam question with answer 200

Question:
Which of the following is not a valid way to reload Prometheus configuration?

1. send a POST request to /-/reload with the --web.enable-lifecycle flag
2. send a SIGHUP signal to the prometheus process
3. restart prometheus server(systemctl restart prometheus)
4. promtool config reload

Answer:
D - is the correct answer