Which database management systems are supported by Zabbix for storing collected data?

Zabbix supports a range of database management systems for storing collected data, primarily focusing on those that offer robust features for handling time-series data, which is essential for monitoring applications. The correct choice includes MySQL, PostgreSQL, SQLite, and Oracle, all of which are known for their reliability, community support, and performance in managing structured data.

MySQL is widely used with Zabbix due to its ease of use and strong performance in read-heavy environments. PostgreSQL is another strong contender that offers advanced features like complex queries and data integrity. SQLite is particularly useful for smaller-scale environments or for testing purposes because it can run without a separate server. Oracle, being a major enterprise database, provides powerful capabilities and is suitable for larger installations requiring high availability and transactional support.

The other options contain databases that are either not supported by Zabbix or are not suitable for the specific needs of monitoring systems. For example, databases like MongoDB and Firebase fall under NoSQL databases, which Zabbix does not support as it relies on structured relational databases to efficiently manage and retrieve monitoring data.

Overall, the selection of databases in the correct answer is aligned with Zabbix's operational needs and the underlying architecture designed for high-performance data handling.