An Engine Had a Fault Code for High Crankcase Pressure

An engine had a fault code for high crankcase pressure, and its power is derated. Technician A says that the crankcase filter could have frozen when it was exposed to extreme cold conditions. Technician B says that a frozen filter would likely blow engine gaskets and seals rather than cause a derate condition. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B