If You Add Shims to a Longitudinal Torque Rod Attached

If you add shims to a longitudinal torque rod attached to the forward drive axle carrier in a tandem drive truck,which of the following will result?

A) only the working angles of the U-joints in the front driveshaft will change
B) only the working angles of the U-joints in the rear driveshaft will change
C) the working angles of the U-joints in both driveshafts will change
D) no U-joint working angles will be affected