which of the following uses professional email standards?
A. it's professional to write in all caps to convey how serious I am
B.It's completely professional to send an email without signing it with my first & last name. my teacher will know it's me
C.Every email must begin with a greeting, followed by a grammatically correct message & last but not least, my signature (first & last name).

D what email? why would I ever communicate with my teacher?!