Azure Database for MariaDB is a relational database service with the following features:
* Build-in high availability without any extra cost
* Autoscaling whenever required, within seconds
* Enterprise-level security and compliance
* Predictable performance with the pay-as-you-go model
* Auto backups and point-in-time-restore for up to 35 days
* Protection and security of confidential data in motion as well as at rest Azure Database for MariaDB has a limitation that the mysql system database in Azure Database for MariaDB is a read-only as it supports a number of PaaS functionality. You can't make any changes to the mysql system database.
Option A is incorrect. Azure Database for MariaDB delivers build-in high availability without any additional cost and predictable performance with a pay-as-you-go pricing model.
Option B is correct. The mysql system database in Azure Database for MariaDB is a read-only as it supports a number of PaaS functionality. You can't make any changes to the mysql system database.
Option C is incorrect. Azure Database for MariaDB delivers autoscaling in seconds when required, auto backups, and power-in-time-restore.
Option D is incorrect. Azure Database for MariaDB delivers secured protection of sensitive data in motion as well as at rest, and also offer enterprise-level compliance and security.
References: To know more about the Azure Database for MariaDB, refer to the links below:
https://docs.microsoft.com/en-us/azure/mariadb/overview
https://docs.microsoft.com/en-us/azure/mariadb/concepts-limits