Single/multi-choice problem: Which of the following solutions is better for the following goal:
how to use a plunger

Options are:
* Submerge the plunger (the top of the bell should be covered with water) and make sure the rubber ring is inserted directly into the drain opening. Push and pull on the handle with quick, concentrated thrusts for 20 seconds without lifting the plunger out of the drain and breaking the seal..
* Submerge the plunger (the top of the bell should be covered with water) and make sure the rubber ring is inserted directly into the drain opening. Push and pull on the handle with quick, concentrated thrusts for 2 seconds without lifting the plunger out of the drain and breaking the seal..
Submerge the plunger (the top of the bell should be covered with water) and make sure the rubber ring is inserted directly into the drain opening. Push and pull on the handle with quick, concentrated thrusts for 20 seconds without lifting the plunger out of the drain and breaking the seal.