A customer has been having problems with SMS responses getting the default keyword response rather...

Comprehensive and Detailed Explanation:

The correct answers are A and C.

A — If responses are not received within the configured Conversation Window (e.g., 30 mins, 1 hour), MobileConnect treats them as unrelated and sends the default response.

C — If a Next Keyword is not specified on the outbound message, MobileConnect has no instruction for how to handle a reply, so it falls back to the default keyword response.

❌ Why others are wrong:

B: The Conversation Window is based on minutes/hours, not 24 hours.

D: If a response contains "stop," it triggers an opt-out process, not a fallback default keyword response.

Exact Extract from Salesforce Official Documentation:

Salesforce Help — MobileConnect Conversation Window and Next Keyword Setup:

"Ensure that outbound messages include a configured Next Keyword to direct subscriber responses. Responses received outside the Conversation Window are treated as unrelated and routed to the default keyword response."

(Source: https://help.salesforce.com/s/articleView?id=sf.mc_ms_conversation_window.htm )

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