communicate several messages

Suppose you are a manager who needs to communicate several messages to employees of the company. 

 1. The CEO abruptly resigns after the news media reported, the CEO embezzles millions of dollars 

 2. A plan to relocate the company 

 3. The death of an employee 

 4. The reassignment of one division to a new location 

 For each of the messages above:

List the medium (telephone, email, text, face-to-face meeting, etc.) you would use to communicate the message.

Explain why you choose that medium over the other possible mediums.