Two Technicians Are Discussing Proportioning Valves

Multiple Choice

Two technicians are discussing proportioning valves. Technician A says proportioning valves are designed to keep the disc brakes from applying before the drums. Technician B says that load-sensing proportioning valves sense vehicle load and adjust brake pressure. Who is correct?

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