Please choose the correct solution to the question: how to use a plunger

Solution1: 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.

Solution2: 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.

Answer format: solution1/solution2
Answer: solution1