A) QRM
NJ2X Notes:
Q-signals are codes abbreviating a detailed question or answer. The codes, as agreed upon by the International Telecommunication Union, are used worldwide on radiotelegraph.
Q-signal abbreviations are given the form of a question when followed by a question mark. When an abbreviation is used as a question and is followed by additional or complementary information, the question mark should follow this information.
example:
QRZ? QRZ? - means, "who is calling?"
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