The correct answer to the following question will be "Text message".
Explanation:
Text messaging would be the method of writing and transmitting written messages, usually alphabetical and numerical symbols or characters, between two or even more operators of mobile phones and tablets, laptops/desktops, or other compatible computers.
You can send texts over a mobile phone network or send them via a Connection to the internet as well.
Hence, text messages would be the best channel of communication.
