A) Send only the minimum information needed for proper identification and the contest exchange
Efficiency counts in radio contests. The more stations you can contact in a given period of time the higher your score. You gain an edge over the competition when your contact rate exceeds theirs. One way to improve your rate is to make sure you understand the specific requirements for contest you are participating in regarding the exchange. This allows you to both deliver, receive, and log the required information. Including extra unnecessary information only slows your rate (and that of your contact).
Written by: NJ2X, Michael Maher