Technician a Says That Variable Diameter Pulley (VDP) Continuously Variable

Multiple Choice

Technician A says that Variable Diameter Pulley (VDP) Continuously Variable Transmissions (CVT) will often have a planetary gear set to produce reverse. Technician B says that many CVT's in vehicles use a rubber drive belt between two pulleys to transfer power. Who is correct?

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