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How can unidirectional communication be accurately described?

1. Must be full duplex

2. Uses feedback signals to verify that a command has been received or followed

3. Is less prone to electrical noise than bidirectional communication

4. Does not verify the receipt of commands

The correct answer is: Does not verify the receipt of commands

Unidirectional communication refers to a type of data transmission where information flows in one direction only, without any return path for responses or acknowledgments. This characteristic means that once a message is sent, the sender does not receive confirmation or feedback from the receiver about whether the message was received or acted upon. Thus, the defining feature of unidirectional communication is that it does not include mechanisms for verifying the receipt of commands, making it distinctly separate from bidirectional communication, where each party can send and receive messages. This one-way nature can be advantageous in scenarios where quick, straightforward communication is necessary without the need for immediate confirmations, but it inherently lacks the checks and balances provided by feedback signals found in two-way systems. In contrast, other choices relate to different aspects of communication protocols. Full duplex refers to the ability of a system to transmit and receive simultaneously, which does not pertain to the unidirectional model. Feedback signals, mentioned in another choice, are integral to bidirectional communication, as they provide necessary confirmations. The assertion regarding susceptibility to electrical noise may vary based on various factors and is not a defining trait of unidirectional communication.