If the tablet is on stock firmware the build number is identical with the bootloader.it suppose to be JOP4OD.US_epad-10.6.1.14.10-20130801 for the build number
On this firmware you have two options if you only want to root the tablet: Kingo Android Root or Towelroot (version 1 only).
Kingo is a program you install on your PC and run it to root the TF700.
Towelroot is an apk you run on your tablet. Version 1 is hard to find, PM me if you need a copy.
But I would recommend you unlock the tablet, flash a custom recovery and custom rom. You'll like the result - I pretty much guarantee it
It's all covered in the guide I linked to earlier. It''s very much step-by-step. Follow it and you'll be fine.
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