Which sentence demonstrates the appropriate level of formality to use when communicating with coworkers?

hey, seriously, don’t leave the computer on.
i would like to request your cooperation in ensuring that the computer is shut down at the termination of business hours.
remember to turn off your computer at the end of the day.
failure to properly shut down the computer will eventuate in technical difficulties.

Probably C. Please remember to turn off your computer at the end of the day. I would say this because B and D are something a Boss would say to his employees, not you to your co - workers. Also A seems like it could work but it is not formal like a communication at work. The only option left is C. Once again I am not a 100% sure, so look at the other answer before answering. Thanks!

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