You currently have a MySQL database running on Cloud SQL with a read replica in a different zone for non-mission critical analytics workloads. You want to enable high availability (HA) for the analytic workloads while keeping costs low. What should you do?

A. Increase the size of the read replica instance and enable HA. B. Enable HA on the current read replica. C. Create a new HA instance in the same zone as the primary. D. Create a new HA instance in a different region than the primary.