Correct answer - "MessageGroupId" : The message group ID is the tag that specifies that a message
belongs to a specific message group. Messages that belong to the same message group are always
processed one by one, in a strict order relative to the message group (however, messages that
belong to different message groups might be processed out of order).
Incorrect Answers -
"MessageDeduplicationId" - The message deduplication ID is the token used for deduplication of
sent messages. If a message with a particular message deduplication ID is sent successfully, any
messages sent with the same message deduplication ID are accepted successfully but aren't
delivered during the 5-minute deduplication interval.