This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to tie down a kayak
Get padding for your roof rack.
Padding will prevent your roof rack from damaging your kayak during your drive. You can use padding blocks that sit on top of the roof rack bars, or you can use padding that wraps around and velcro over the bars.

pick from the following.
1). You can find roof rack padding online or at your local sporting goods store. Get kayak straps with cam buckles..
2). Padding will also support the kayak in case it falls over or stalls out. Make sure that the padding you choose is sturdy and waterproof..
3). Layer padding onto your roof rack bar bars, and lay the padding over the bars so that it sits parallel to the ground. Place a helmet or hood over the top of the padding..
4). Padding can be left on the roof rack bars or on the back of your kayak. Padding blocks, with built-in padding, can be purchased at many craft stores or online..
The answer is:
1).