Which of the following is good practice when contacting another station in a contest?
Signing only the last two letters of your call if there are many other stations calling
Contacting the station twice to be sure that you are in his log
Sending only the minimum information needed for proper identification and the contest exchange✓الإجابة الصحيحة
Adding “Please copy” before your exchange
الشرح
Contest exchanges are kept to the minimum needed for correct identification and a valid log entry precisely because throughput matters and repeated or padded transmissions waste everyone's time. Partial call signs are worse than useless since they prevent correct identification, and duplicate contacts clutter the log rather than protecting it.