What hurts less, landing with your knees straight or landing with your knees bent?

a	Knees bent; force of impact is distributed to your entire body
b	Knees straight; force of impact is localized which causes only one part of your body to hurt instead of multiple.
c	Knees straight; time of impact is decreased, lowering the force of impact
d	Knees bent; time of impact is increased, lowering the force of impact