The correct answer is Simplex Communication.

• Simplex Communication
  • Simplex communication is a communication channel that sends information in one direction only.
  • Only one of the two devices on a link can transmit, the other can only receive.
  • It can use the entire capacity of the channel to send data in one direction.
  • Examples of simplex include radio broadcasting, television broadcasting, computer to printer communication, and keyboard to computer connections.

•  Half-duplex Communication
  • The direction can be reversed, i.e., the station can transmit and receive the data as well.
  • Messages flow in both directions, but not at the same time.
  • The entire bandwidth of the communication channel is utilized in one direction at a time.
  • Example- Walkie-talkie
• Full-duplex Communication
  • The communication is bi-directional, i.e., the data flow in both directions.
  • Both the stations can send and receive the message simultaneously.
  • It is the fastest mode of communication between devices.
  • Example- Telephone network