Technician a Says That Reverse Masking or Bridge Masking a Series

Technician A says that reverse masking or bridge masking a series of layers of paper is used so one layer can be pulled off with each successive coat of material applied. Technician B says that a good painter does not need to remove any parts that are not to be painted. Who is correct?

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