Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to get rid of dark spots from acne [title] Rub lemon juice on the spots. [step] Lemon juice can be used as a natural skin-lightening agent. Put freshly-squeezed lemon juice on a cotton ball or a cotton swab and then dab it onto your dark spots.

Ending1: Do not rub the lemon juice directly on the spot, though. Instead, let it sit on your skin for at least 30 to 60 minutes. Ending2: Keep rubbing the lemon juice into your acne spots until they lift up and disappear. Then, when you see them, give the lemon juice a few minutes to work its magic. Ending3: For a stronger lightening agent, combine two parts lemon juice and one part olive oil. Make sure the product you use is oil-free, as olive oil acts as a " freshener " for acne. Ending4: [substeps] Let the juice dry for about ten minutes. Without rinsing the lemon off, apply a moisturizing oil on top of it.

Answer format: ending1/ending2/ending3/ending4