Hello Ashley, so basically we all know what email is, but a brief explanation is messages distributed by electronic means from one computer user to one or more recipients via a network. So to use email efficiently (BTW I don't know if this is select all that apply or multiple choice, so I'll do both) you need to have the most important info coming in first. Then, to top that and be an email master, so to speak, you have to bullet and highlight important issues and topics so A, if its multiple choice and A+B if it is select all that apply.
Hope this helped!