I know that it is not allowed to post the links here. I have found the article about your question on forgottenstoriesweb.
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The correct answers are 1 and 2. The word protocol comes from a latin word referring to the first page of a book in which the content was written, it was adapted to english to refer to rules of conduct that rule any given thing. So a communication protocol will provide guidelines to the communication between the sender and the recipient of a message, this applies even when the message is shared between friends, relatives or coworkers.
Option 3 seems the most human and relatable!
Try from front and back first then go try middle and you pick the colors
