A developer is making the ModifyDDInstanceSpec API call to change the specifications of an RDS instance, but the operation fails. Why could this be? (Number of correct answers: 3)

Which of the following is NOT a valid state for a scaling activity in Alibaba Cloud's Elastic Scaling Service ESS -also known as Auto Scaling) state of the scaling activity in the Alibaba Cloud elastic scaling group?

Which of the following database connection methods does ApsaraDB for Redis support? (Number of correct answers: 2)

Function Compute supports one-way triggers and two-way triggers. Which of the following triggers is a one-way trigger? That is to say you only need to configure the trigger in the event source, not in Function Compute?.

Alibaba Cloud RabbitMQ is typically used in scenarios where message publishing and consumption performance requirements are high. Which of the following are supported message types in Alibaba Cloud Rabbit MQ? (Number of correct answers: 3)