PCA (Prometheus Certified Associate) sample exam question with answer 108

Question:
What are the core components of Prometheus?

1. Instrumentation and Exporters
2. Prometheus, Alertmanager, Grafana
3. Prometheus, Alertmanager, Pushgateway, Client Libraries, Exporters
4. Prometheus, InfluxDB, Alertmanager

Answer:
C - components
A - While these are important components of a Prometheus setup, this answer omits important core components such as Prometheus itself as well as Alertmanager.
B - Grafana is not a core component of Prometheus. While it is the most popular application for visualizing Prometheus metrics,
D - InfluxDB is not a core component of Prometheus. InfluxDB is a completely separate monitoring tool