Technician a Says That Reed Switches Produce an AC Signal

Multiple Choice

Technician A says that reed switches produce an AC signal. Technician B says that a magnetic Vehicle Speed Sensor (VSS) can be diagnosed by observing the pattern on a lab scope and comparing it to a known good pattern. Who is correct?

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