Formal or Informal communication.?

Question

1. A telephone call to a supplier

2. No verbal response to a spoken message

3. an e-mail

4. a written report to the chief executive officer.

I have no idea what is formal or informal communications.

any help will be appreciated. Thnx

Answer 1

well, im not an expert, but the first three chioces are informal, and the last one is formal.

see you :)

molly