3 duplicate AcroCEF folders exist - Which one(s) can I safely delete?

[nontypicalguy]

There are 3 different places where the acrocef folder is located after a clean uninstall & install of Acrobat Reader DC:

• C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\acrocef_1
• C:\Program Files\Adobe\Acrobat DC\Acrobat\AcroCEF
• C:\Program Files\Adobe\Acrobat DC\Acrobat\acrocef_1

Which one is actually used by Acrobat Reader DC?  Can I delete 1 or 2 of these safely without hindering the application?  Each of these folders contain 189 MB of the same files.