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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
ASend "QSY" on CW or if using phone, announce "the frequency is in use", then give your call and listen for a response
BSend the letter "V" in Morse code several times and listen for a response or say "test" several times and listen for a response
CListen for 2 minutes before calling CQ
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