HPLC
HPLC methods include

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

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HPLC
HPLC stands for

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

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