Technician A checks the oil level before performing an oil change.Technician B checks the oil after the oil has been changed.Who is correct?

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

Both technicians are correct. Technician A checks the oil level before performing an oil change to assess the engine's oil consumption and to ensure there's enough oil for the engine to run safely until the change. Technician B checks the oil after the oil has been changed to ensure the new oil is at the correct level, which is crucial for proper engine lubrication and function.