HPLC
HPLC stands for

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

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HPLC
Dwell volume is defined as

the volume of the column between the point at which solvents are mixed and the beginning of the column
the time required for the gradient to reach the column
the volume of solvent contained in a liquid chromatographic column
none of these

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