What is the best way to: How do you layers of fabric together

Available choices:
(a). Lay each layer of fabric one on top of the other, insert a sewing pin straight through the layers of fabric, then a few milimeters below the hole poke it back up through all the layers of fabric..
(b). Lay each layer of fabric one on top of the other, insert a clothes pin straight through the layers of fabric, then a few milimeters below the hole poke it back up through all the layers of fabric..
Answer:
(a).