Dell Docking Station???? WD19TB or WD19DC

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This is beyond confusing for some reason, but does anyone know what Dell docking station would be best to run dual 4k monitors at 60hz?

The laptop I have is Dell Precision 7520.

I THINK I narrowed it down to the Dell WD19TB or WD19DC but if anyone here knows for sure and has experiance it would be greatly appreciated.

Thanks guys.