A technician takes a compression reading on a 4-cyl. Engine and gets readings of 140, 135, 135 and 40 psi. Then he performs a wet compression test and the readings are almost the same as those in the first test. Technician A says that a burned valve could cause these readings. Technician B says that a broken piston ring could cause these readings. Who is correct? Group of answer choices Technician B only Technician A only Neither Technician A nor B Both Technician A and B