A combination of the Anatolian, Armenian and Kurgan hypothesis since I believe that R1b people domesticated cattle in eastern Anatolia around 10,500 years ago, then moved to the Caucasus region (including Armenia), crossed it to the Pontic Steppe, then expanded to Europe (first by invading the Balkans) and Central Asia. The reason why there are so many hypothesis is that there is some truth in most of them. Even the Paleolithic continuity isn't completely wrong if we consider that both R1a and R1b were already found in Paleolithic Eastern Europe.
The only one that is clearly wrong is the Out of India theory, which emerged from the refusal of some Indian people to believe that the Indo-Aryan invasion happened and that they are partly descended from Europeans. However R1b* may have originated somewhere between Afghanistan, Turkmenistan and Iran after R* or R1* people from Siberia moved across Central Asia. That would explain the presence of teal Gedosian-like admixture in Yamna R1b people.
Here is the migration map of R1b.
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