What is the purpose of this setting?

Exploring the Production environment, you find MYSQL_USE_SLAVE_CONNECTION is enabled.

What is the purpose of this setting?
A . To split the database tables between the three Production servers and improve performance.
B . To enable fault tolerance on the MySQL cluster.
C . To utilize the read-only slave servers and improve the overall performance.
D . To allow database backups from a MySQL slave server with minimal impact on the Production site.

Answer: C

Explanation:

Reference: https://devdocs.magento.com/cloud/env/variables-deploy.html