How Does the Therapist Measure the Correct Height for Axillary

How does the therapist measure the correct height for axillary crutches?

A) In supine the therapist should measure the distance from the head of the humerus to the lateral malleoli and subtract 6 in.
B) In supine the therapist should measure the distance from the axilla to the lateral border of the heel and subtract 6 in.
C) In standing there should be about four finger widths beneath the axilla with the crutches approximately 2 in.lateral and anterior to the foot.
D) In standing there should be approximately 2 in.below the axilla with the crutches approximately 2 in.lateral and 6 in.anterior to the foot.