E1B01

Which of the following constitutes a spurious emission?

1. AAn amateur station transmission made without the proper call sign identification
2. BA signal transmitted to prevent its detection by any station other than the intended recipient
3. CAny transmitted signal that unintentionally interferes with another licensed radio station and whose levels exceed 40 dB below the fundamental power level
4. DAn emission outside the signal's necessary bandwidth that can be reduced or eliminated without affecting the information transmitted

Pick an answer to check it.