Exam AWS Certified SysOps Administrator - Associate topic 1 question 459 discussion

I go with A

Answer B is incorrect because Aurora replicas always have the same DB instance size/class as the one used by the primary instance. Answer C is incorrect because in the Aurora Auto Scaling policy, you cannot select as metric the average CPU utilization of the primary instance (you must choose a predefined or custom metric that consider the status of ALL THE READ REPLICAS). Answer D is incorrect because in the Aurora Auto Scaling policy, you cannot select the average CPU utilization OF THE EXISTING Aurora Replica (you CANNOT CHOOSE a predefined or custom metric that consider only A SUBSET OF READ REPLICAS). Answer A is correct: you just need to define and apply an Aurora Auto Scaling policy, choosing Average CPU utilization of Aurora Replicas as the target metric.

Answer is C