Please choose the correct ending to complete the given sentence: Youth: [header] How to avoid a teenage pregnancy [title] Use condoms for reliable, inexpensive birth control. [step] Condoms are one of the easiest to use birth control options. Remove the condom from the wrapper and roll the condom onto the erect penis.

Ending1: Make sure that the rim of the condom is on the outside, so that it will roll on more easily. Condoms last a long time, but they do expire. Ending2: If the ring feels hard, you might have a problem with the condom slipping off. [substeps] Check the packaging of condoms you purchase. Ending3: Then, place the tip of the condom between the pad and the penis. Wait for the tip to come into contact with the penis. Ending4: Gently press the circle firmly down until the tip lies against the sensitive base of the penis. [substeps] If you use latex condoms, you could get a hard-case contract in a store.

Answer format: ending1/ending2/ending3/ending4