How to select appropriate medium
You can choose the media through the following factors:
- cost
- speed
- record of messages
- reliability
Cost
You should choose the media that you can afford without stressing your wallet or if possible a free medium
Speed
You shoudn't choose a medium that might take a few months to get the message across even if it's free
You should chose a medium with a fast speed
Record of the messages
This depends on whether you want to keep a record of the messages that you sent.
Reliability
The message could get disrupted easily if you choose an unreliable medium, the message could get lost easily.