Question Pool -- Category G2D

Why should I keep a log if the FCC doesn't require it?
A.
To help with your reply, if FCC requests information on who was control operator of your station for a given date and time
B.
Logs provide information (callsigns, dates & times of contacts) used for many operating contests and awards
C.
Logs are necessary to accurately verify contacts made weeks, months or years earlier, especially when completing QSL cards
D.
All of these choices

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