Final answer:
The simplest communication model is the action model, followed by the interaction model, with the transaction model being the most complex.
Step-by-step explanation:
When ranking the relative complexity of communication models, with the simplest at the top and most complex at the bottom, the order would be:
- Action
- Interaction
- Transaction
The action model is the simplest, as it involves a one-way process where a sender transmits a message to a receiver, who does not provide feedback. The interaction model adds a level of complexity by incorporating feedback from the receiver to the sender, making it a two-way process. Lastly, the transaction model is the most complex as it views communication as a dynamic and simultaneous process, where all parties are both senders and receivers, engaging in a mutual exchange of messages and reactions which can influence the communication flow.