Question Pool -- Category G1B

What are the restrictions on the use of abbreviations or procedural signals in the amateur service?
A.
There are no restrictions
B.
They may be used if they do not obscure the meaning of a message
C.
They are not permitted because they obscure the meaning of a message to FCC monitoring stations
D.
Only "10-codes" are permitted

Answer is B . . . See 97.113a4.
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