Technician a Says Serial Data Passing Through the Vehicle's Data

Technician A says serial data passing through the vehicle's data bus can be monitored with a scan tool. Technician B says serial data travels through the vehicle on a twisted pair of wires-one wire is grounded to the chassis and the other wire is the serial bus transmission wire. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B