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G2B06

What is a practical way to avoid harmful interference on an apparently clear frequency before calling CQ on CW or phone?

SelectAnswer
AListen for 2 minutes before calling CQ
BSend the letter "V" in Morse code several times and listen for a response or say "test" several times and listen for a response
CSend "QSY" on CW or if using phone, announce "the frequency is in use", then give your call and listen for a response
DSend "QRL?" on CW, followed by your call sign; or, if using phone, ask if the frequency is in use, followed by your call sign