Technician a Says the Yaw Sensor Can Measure the Difference

Technician A says The yaw sensor can measure the difference between the actual direction that the vehicle is traveling and the direction the driver is trying to steer the vehicle by way of the steering angle sensor . Technician B says This difference is called the slip angle . Who is correct?

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