Technician a Says If the Distance Between the Leading Edges

Multiple Choice

Technician A says if the distance between the leading edges of the front tires is less than the distance between the trailing edges, then there is toe-in. Technician B says front toe-in is adjusted by adding or removing shims between the upper control arms and the body/frame. Who is correct?

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