HPLC
HPLC methods include

liquid/liquid (partition) chromatography
All of these
liquid/solid (adsorption) chromatography
ion exchange and size exclusion chromatography

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HPLC
HPLC stands for

both (a) and (b)
Highly Placed Liquid Chromatography
High Pressure Liquid Chromatography
High Performance Liquid Chromatography

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