Which of the following descriptions describes the (Security Token Service) STS service correctly? (Number of correct answers: 3)

Which of the following descriptions describes the (Security Token Service) STS service correctly? (Number of correct answers: 3)
A . Through the STS service, RAM users or RAM roles can obtain a temporary token that allows them to call the Alibaba Cloud API or use the web console
B . A STS request consists of an access address, communication protocol, request method, request parameters and character encoding
C . 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
D . The STS service supports the use of both HTTP and HTTPS protocols

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Answer: A,B,C