If you deploy an e-commerce website on HUAWEI CLOUD, in order to benefit old customers, and are ready to engage in a one-day sale, what preparations should operation and maintenance personnel make on HUAWEI CLOUD in advance? (Multiple Choice)

If you deploy an e-commerce website on HUAWEI CLOUD, in order to benefit old customers, and are ready to engage in a one-day sale, what preparations should operation and maintenance personnel make on HUAWEI CLOUD in advance? (Multiple Choice)
A . Use HUAWEI CLOUD’s stress testing service Cloud Eys to practice the high-traffic service capabilities of the website in advance
B . Add the indicators that need to be viewed during routine operation and maintenance into the dashboard so that you can grasp the overall situation in real time
C . Set threshold alarms for key application performance indicators of the website, and automatically notify operation and maintenance personnel of the alarms
D . Prepare resources in advance. Set up an elastic scaling group to expand capacity in time as resource usage rises during the promotion process

Answer: BCD