A technician is testing an undocumented digital system with a signature analyzer. What indications should the technician look for?
A) Look for similar signatures that show up at different points in the circuit; no two points should be the same.
B) As signals flow from one circuit to another, changes will take place; look for changes in the signatures, especially between inputs and outputs.
C) Without documented signatures, the instrument is basically useless.
D) Use a logic analyzer to verify the correct operation of the signature analyzer; once its accuracy has been confirmed, its indications can be relied upon for troubleshooting.
C
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If 
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