Answer:
a. Resist humor and sarcasm.
b. Be concise.
d. Care about tone.
Step-by-step explanation:
Sending a message to the supervisor is considered formal writing. As such, it should have formal writing characteristics.
It should be void of humor and sarcasm because the tone is meant to be professional and business like. Messages should be concise and straight to the point. And as this is a formal letter, care must always be taken to ensure that the tone is formal.