Once a message is sent, an alert originator should do which of the following? A. Continue to monitor the situation and cancel the message, if nothing changes, in the prescribed number of hours for the affected jurisdiction. B. Report to the Federal Emergency Management Agency (FEMA) that the message was sent. C. Send recurring copies of the same message every 30 minutes until the event concludes. D. Continue to monitor the situation and send updated messaging, as appropriate, keeping in mind the information that was already sent for relevancy