Multi-choice problem: Choose from the options at the end, and answer how do you do this: In order to put shingles on a roof,

Available choices:
+lay the shingle down in the position you want it, then use a nail gun to put several screws along the top..
+lay the shingle down in the position you want it, then use a nail gun to put several nails along the top..
lay the shingle down in the position you want it, then use a nail gun to put several nails along the top.