Technician a Says That PID Control Involves Using Control Loops

Technician A says that PID control involves using control loops that use fixed lookup tables to continually adjust engine actuator output. Technician B says that when the lookup table is uploaded to an ECM, it is used to help solve mathematical problems such as how much fuel the ECM commands for injection. Who is right?

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