Final answer:
Stolons are stems that grow out over the surface of the soil from existing stems and give rise to new plants at the nodes.
Step-by-step explanation:
Stolons are stems that grow out over the surface of the soil from existing stems. They run almost parallel to the ground or just below the surface, and can give rise to new plants at the nodes.
Runners are a type of stolon that run above the ground and produce new clone plants at nodes. Therefore, the correct answer is option 2) Stolons.