A swimmer is in contact with the wall and the water of a swimming pool. To start moving, the swimmer pushes on the wall with a force of 180 N directed backwards. Which force is paired with the force the swimmer exerts on the wall?
A 180 N180\ \text{N}180 N force directed backwards on the swimmer, exerted by the wall.
A 180 N180\ \text{N}180 N force directed forwards on the wall, exerted by the swimmer.
A 180 N180\ \text{N}180 N force directed forwards on the swimmer, exerted by the wall.
A 180 N180\ \text{N}180 N force directed forwards on the swimmer, exerted by the water.