You have provisioned a chatbot in Azure. To offer a great customer experience, you welcome the user and provide the basic instructions on thefirst connect over the channel. You set the property value for welcomedUserProperty in the userstate to true. Given the requirement that you want to welcome a user when he joins the chatbot for the first time, you use method OnMessageActivityAsync in your code for this purpose.
Choose if the statement given above is true or false.

Answer options:

A.True
B.False

Correct Answer: A
Option A is correct because the statement is false. When a user is added to the conversation on the chatbot, OnMembersAddedAsync method is used togreet the user and provide the basic instructions on how to use the bot such as keywords, commands, urls and the purpose of the bot. Additionally, by setting the property DidBotWelcomeUser value to true, you can validate if the user was welcomed or not while he initiated a new input and send the welcome message.
Option B is incorrect because the method OnMessageActivityAsync is invoked when a new user input is received, not when the user joins for the first time. 
Reference: 
To learn more about sending welcome message to user in chatbot, use the link given below: 

https://docs.microsoft.com/en-us/azure/bot-service/bot-builder-send-welcome-message?view=azure-bot-service-4.0&tabs=csharp