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pic Question was not answered Durin g the process of backing up an RDS database, a developer found that the backup failed. What might cause this to happen? o The database instance is not stopped o DDL operations were performed during the backup o DML operations were performed during the backu p DCL operations were performed during the backup Question was not answered Which of the following descriptions describes the (Security Token Service) STS service correctly? (Number of correct answers: 3) o Through the STS service, RAM users or RAM roles can obtain a temporary token that allows them to call the Alibaba Cloud o API or use the web console A STS request consists of an access address, communication protocol, request method, request parameters and character encoding o When calling the STS API, in order to ensure the safe calling of the API, Alibaba Cloud will authenticate each API request through a signature when each API call is made The STS service supports the use of both HTTP and HTTPS o protocols Question was not answered When a developer calls the Alibaba Cloud SDK to access Elastic Compute Service (ECS), the following error is returned; RealNameAuthenticationError