When we talk about the 'Elastic' feature for ECS product, we are not talking about.

RDS for MySQL is a PaaS, which means after creating the RDS instance, the user does not need to take care of the underlying OS, runtime environment of software packages. These would be taken care of by Alibaba Cloud.

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

Server Load Balancer supports health checks for ECS instances and allows user to specify the frequency. If an ECS instance does not qualify the health check, traffic will not be forwarded to that instance, thereby ensuring application availability.

Multiple lower-configuration I/O-optimized ECS instances can be used with to deliver a high- availability architecture.