Answer:
The telephone, radio, television, and the internet.
Step-by-step explanation:
The telephone, radio, television, and internet are the four main types of communication technologies that have contributed to the convenience of sending communications.
Sorry if this wasn't what you were looking for! ^^;
Edit:
It could also be via:
- E-mail.
- Website.
- Phone Technology.
- Text Messaging.
- Social Media.
- Video Messaging.
- Handwritten Notes.
Thank you for your time! I tried improving my answer because of the low rating that was given (3 stars).