Which model of communication views communication as a constant process in which all parties simultaneously play the roles of sender and receiver?

The correct answer to the following question will be the "Transactional Model of Communication".

Explanation:

The interchange of the messages among the accuser and the accused (Receiver and sender) where each sends text messages or receives take turns, is the Transactional model of communication and is also called the Circular model of communication.For interpersonal communication, this communication model is most often used.

Therefore, it's the right answer.