Azure bot communicates with Bot Connector service. To implement the security of this communication, whenever bot sends a request to the Connector service or the request is sent vice-versa, there must be information that could be used for the verification of relevant identity. 
Which of the below could be used between the bot and the Bot Connector to verify identity? 
(Choose 4)

Answer options:

A.SSL/TLS
B.OAuth 2.0
C.JSON Web Token (JWT)
D.BotAuth 2.0 and above
E.OpenID metadata

Correct Answers: A, B, C, E
Option A is CORRECT because trust could be established between the bot and the Bot Connector using SSL/TLS, OAuth 2.0, JSON Web Token (JWT), and OpenID metadata.
Option B is CORRECT because trust could be established between the bot and the Bot Connector using SSL/TLS, OAuth 2.0, JSON Web Token (JWT), and OpenID metadata.
Option C is CORRECT because trust could be established between the bot and the Bot Connector using SSL/TLS, OAuth 2.0, JSON Web Token (JWT), and OpenID metadata.
Option D is INCORRECT because BotAuth 2.0 and above is an INVALID option.
Reference: 

https://docs.microsoft.com/en-us/azure/bot-service/rest-api/bot-framework-rest-connector-authentication?view=azure-bot-service-4.0