Technician a Says That Low Compression on an Engine Cylinder

Multiple Choice

Technician A says that low compression on an engine cylinder can be successfully compensated for by the PCM with no adverse effect on performance or emissions. Technician B says that the PCM and catalytic converter can mask or hide some basic engine defects. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B