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

In a radio contest, speed and efficiency are the primary goals. Because stations are trying to log as many contacts as possible, you should only send your complete call sign and the specific exchange required by the contest rules. Adding conversational phrases like 'Please copy' slows down the exchange and clutters the frequency. Sending only partial call signs (like the last two letters) is illegal and confusing, while contacting a station twice to ensure you are logged wastes time and can result in duplicate penalty points for the other operator.