Answer:
Video Conferencing
Step-by-step explanation:
Based on the information provided within the question it can be said that the one appropriate media for the CEO to use would be Video Conferencing. This would allow everyone that needs to hear the message to connect via video calling to the same lobby in which the CEO can make the announcement. This form of communication get's rid of the misunderstandings or "lost in transit" problems that sometimes arise from more traditional communication methods such as text or email's