How Does Prometheus Gather Information About Monitored Hosts and Services

Multiple Choice

How does Prometheus gather information about monitored hosts and services?

A) It implements the ICMP and SNMP protocols to ping and query remote services.
B) It opens a webhook where monitored applications have to submit various metrics.
C) It uses HTTP to retrieve JSON encoded metrics from the monitored objects.
D) It queries a relational database for metrics written to the database by monitored applications.
E) It runs scripts on the Prometheus server which perform tests and return various metrics.