A Database Specialist is planning to create a read replica of an existing Amazon RDS for MySQL Multi-AZ DB instance. When using the AWS Management Console to conduct this task, the Database Specialist discovers that the source RDS DB instance does not appear in the read replica source selection box, so the read replica cannot be created.
What is the most likely reason for this?

A. The source DB instance has to be converted to Single-AZ first to create a read replica from it.
B. Enhanced Monitoring is not enabled on the source DB instance.
C. The minor MySQL version in the source DB instance does not support read replicas.
D. Automated backups are not enabled on the source DB instance.