Answer:
out of these options, only "by word of mouth" makes sense.
Step-by-step explanation:
but in today's networking world there should be normally a tool, where the project team updates the information (ideally on a daily basis), and peers, managers, executives and other interested parties can see the updated summary information for their purpose.
but when and how should they be "triggered", if something happened that jeopardizes the business plan ?
immediately, in person. don't wait for any process and practice steps to deliver the information. valuable time would get lost. and I guess, that is what was meant by the question.