TOWGS84GeoKey transformation method

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TOWGS84GeoKey transformation method

Alexander Zhdanov
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Greeting!

I am writing a program for reading GeoTIFF files and I have a question about TOWGS84 geokey.
Do I correctly understand that in EVERY GeoTIFF file these geokey parameters BY DEFAULT are parameters for Bursa-Wolf formula.
If not, how can I recognize which transformation method should use with these parameters - Bursa-Wolf, Coordinate Frame Rotation or Molodenski?

Best regards, Alexander Zhdanov.