How should a footboard be situated in relation to a patient’s feet?

A footboard should be tilted so that the patient can freely bend his or her ankles.
A footboard should be placed upright and against the soles of the feet so that ankles will not bend.
A footboard should be placed over a patient’s feet to hold up linens and reduce pressure.
A footboard should be placed under ankles in order to reduce pressure between the feet and the bed.