To add or remove ECS instances in a scaling activity, following steps are involved: A. Check the health status and boundary condition of the scaling group and check the status and types of ECS instances; B. Assign the activity ID and execute the scaling activity; C. Modify the ECS number of instances of the scaling group; D. Create the ECS instances. Which of the following orders is correct?
A trading firm uses SLB service, and due to the trading services being sensitive to latency, the user may reduce the health check frequency and increase the time interval between health check since a high frequency healthy check may slow down the traffic.