You run a web application with the following components Elastic Load Balancer (EL8), 3 Web/Application servers, 1 MySQL RDS database with read replicas, and Amazon Simple Storage Service (Amazon S3) for static content. Average response time for users is increasing slowly. What three CloudWatch RDS metrics will allow you to identify if the database is the bottleneck? (Choose three.)

A. The number of outstanding IOs waiting to access the disk.
B. The amount of write latency.
C. The amount of disk space occupied by binary logs on the master.
D. The amount of time a Read Replica DB Instance lags behind the source DB Instance
E. The average number of disk I/O operations per second.