What is the best way to: How to replace fabric from cushion on a chair.

Options are:
a). Remove the cushion off of the chair. If there is staples on the bottom of the cushion, remove them with a knife. Using a new fabric, staple down the excess fabric on the cushion to the bottom using a staple gun.;
b). Remove the cushion off of the bed. If there is staples on the bottom of the cushion, remove them with a knife. Using a new fabric, staple down the excess fabric on the cushion to the bottom using a staple gun.;
Answer:
a).