Immersion if you want to speak it.
If you study only with a program/book/audio you'll be able to read and listen but you'll be lacking in speaking since you won't have a chance to pick up the "music" of the language without hearing it around you constantly.
Also, unless you have a knack for languages, learning another one as an adult is hell. However, I keep being told if you can get it under your belt, #3 is easier.
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