A customer uses Alibaba Cloud Auto Scaling service and creates a scaling group. He/she sets the "Minimum number of instances" to 6 and "Maximum number of instances" to 8.

After correctly configuring scaling settings, the customer adds a scaling rule "Adjust to 10 ECS instances", and creates a scheduled task based on this rule.

And then, the customer checks the scaling group and see it already contains 6 valid ECS instances, he/ she then enables this scaling group immediately.

How many ECS instances are left in the scaling group when the scheduled task is activated once?

A. Eight

B. Ten

C. Six

D. Five

You are developing a highly available web application using stateless web servers. Which services are suitable for storing session state data? (Choose two.)

A. RDS

B. Table Store

C. MaxCompute

D. OSS

Server Load Balancer supports protocols like ______________. (Choose four.)

A. HTTP

B. HTTPS

C. TCP

D. UDP

E. MPLS

F. MQTT

Alibaba Cloud Object Storage Service (OSS) is a massive, highly available, secured and cost effective storage service. One of the special characteristics of OSS is its superior data reliability, because of its underlying backup technology and policies. Which of the following statement about OSS backup is correct?

A. OSS supports 3 internal data copies, so the data can be manually recovered should there be any problem.

B. Customer has to safeguard their own data. OSS provides various backup interfaces to facilitate offsite backups.

C. OSS leverages RAID0+1 configuration of its underlying physical hard disks. There is no impact even if 2 hard disks were to fail simultaneously.

D. OSS supports 3 internal data copies, no human intervention is required to recover the data when anything goes wrong.

Which of the followings are not the operations that you can do on a cloud disk snapshot? (Choose two.)

A. snapshot duplicate

B. snapshot rollback

C. snapshot download

D. snapshot deletion