The correct answer is: D. None of these
Noise is not a barrier. It is a distortion of a signal that can interfere with communication. It can be caused by many things, such as electromagnetic interference, physical obstructions, and human error.
A transmitting barrier is anything that prevents a signal from being transmitted. This could be a physical barrier, such as a wall, or an electronic barrier, such as a firewall.
A receiving barrier is anything that prevents a signal from being received. This could be a physical barrier, such as a wall, or an electronic barrier, such as a jammer.
A sender barrier is anything that prevents a sender from communicating effectively. This could be a lack of knowledge, a lack of confidence, or a lack of motivation.
I hope this helps!