Which Cycles to use and why?

In blender repositories, Cycles code is there in two locations

  1. rB/intern/cycles
  2. rC/cycles

How they are different from each other?
To use Cycles in my application, which Cycles should I use?

Thanks in advance.

From https://www.cycles-renderer.org/development/:

Source code is available either as standalone repository or bundled with the Blender sources, from developer.blender.org.

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