What is the best way to: Top prepare the baking dish,

Pick your answer from:
[a]. roll out a 2' long piece of aluminum foil, crumple it into a ball with your hands, and press the ball into the bottom of the baking dish.;
[b]. roll out a 2' long piece of aluminum foil, and press it into the bottom and sides of the dish and crumple the extra over the sides and top.;
Answer:
[b].