What call sign format is used for a U.S. amateur radio station when operating in a different call district than its licensed district?
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A
The call sign must be changed to match the operating district
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B
The call sign remains unchanged; no district indicator is required under current FCC rules
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C
The operator must add a portable indicator such as /7 after the call sign
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D
A temporary call sign is issued by the FCC for out-of-district operation