Multi-select problem: How does the next paragraph end?

How to make a shower pan
Ensure your floor can support the weight of a shower before beginning construction because the concrete can be quite heavy.
It may be a good idea to reinforce the floor below the shower pan with exterior grade plywood.
Prepare your shower drain prior to pouring the concrete or hire a professional plumber to install the drain you plan to use.

Choose your answer from:
(a). This will ensure that the drain's drain allows water to drain out of the walls to fill this drain. Determine how you'll use and shape your shower pan..
(b). Mix concrete or design your own to create the pot basin. Multiply the depth of the bucket by 10 inches (24.2 cm) to give you the depth of the tub basin..
(c). Make sure the downspouts are located as close to the siding as possible and that they are clear of cracks and leaks. You may be able to handle this job with a carpenter's level..
(d). You will need a two-piece drain. One piece of the drain will sit flush with the floor and connect to drainage pipes beneath the surface..
(d).