Put yourself in the shoes of the plane crash survivors. What would you have done in order
to survive? Is there anything you wouldn't do?

  In order for "me" to survive "I" would put on a parachute and get ready to yeet my self out of existence, just kidding but I would jump lol.

And "I" would'nt be all chill and sit back and not worry about anything.

b.provides a written record of the transaction

the answer to your question is:

strong-mayor system