A Webex Teams Bot Is Deployed but Soon It Stops

Multiple Choice

A Webex Teams bot is deployed but soon it stops responding. Which two explanations are the cause of the issue? (Choose two.)

A) A new webhook was created, which marks the old webhook as inactive.
B) The web server that is set to receive webhooks is not configured to return a 200 message. And the webhook is disabled.
C) The webhook secret is expired and must be refreshed.
D) The refresh token is not being used.
E) The bot owner regenerated the access token on developer.webex.com.