The adjustments to your sextant while correcting for the error of collimation are made by turning two screws bearing on the frame. How are these screws turned?

A
Tighten them both in steps, first one then the other
B
Loosen them both in steps, first one then the other
C
Tighten one first then loosen the other
D
Loosen one first then tighten the other
E