Technician A Says a Refrigerant Is Considered Contaminated If the Refrigerant

Multiple Choice

Technician A says a refrigerant is considered contaminated if the refrigerant contains greater than 2 percent of foreign material(s) .Technician B says moisture and air reduce the system's efficiency and are considered foreign material or contaminants.Who is correct?

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