Which of the following is good procedure when contacting another station in a contest?

Efficiency and speed are the top priorities during a radio contest. To maximize the number of contacts everyone can make, good operating procedure dictates keeping transmissions extremely brief by sending only your full call sign and the specific information required by the contest rules, known as the "exchange." Sending only the last two letters of your call sign is a poor practice and violates FCC identification rules, leading to confusion and delayed contacts. Furthermore, calling the same station twice creates duplicate entries in the log, wasting valuable time for both you and the other operator. Extraneous chatter, unnecessary pleasantries, or sharing equipment details should be avoided completely during a contest run.