A Vehicle Comes into the Shop with the Customer Complaining

A vehicle comes into the shop with the customer complaining about their transmission not working correctly. You test drive the vehicle and find that 4th gear is slipping. Tech A states that the problem could be a bad solenoid A. Tech B states that the problem could be a cracked drum. Who is correct?

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