Option 1: Xylem - Xylem is a type of plant tissue that transports water and minerals from the roots of the plant to the leaves. It consists of interconnected tubes that function like a straw, pulling water up through capillary action.

Option 2: Phloem - Phloem is another type of plant tissue that transports sugars and other organic compounds from the leaves to the rest of the plant. It works in conjunction with the xylem to facilitate the movement of nutrients throughout the plant.

Option 3: Both xylem and phloem - This is the correct answer. Both xylem and phloem are involved in the transport of materials within a plant. Xylem transports water and minerals from the roots upwards, while phloem transports sugars and other organic compounds from the leaves to the rest of the plant.

Option 4: Cortex - The cortex is the outermost layer of cells in the root of a plant. It provides support and protection for the internal tissues, but it does not play a direct role in the transport of water.

In summary, the correct answer is option 3, as both xylem and phloem are involved in transporting water and other essential materials within a plant.