What is the principle behind the HDL measurement?

The HDL measurement involves the use of a specific reagent for cholesterol, such as cholesterol esterase, which reacts with HDL to produce a photometrically measurable product.
The HDL measurement involves the use of a specific reagent for cholesterol, such as cholesterol oxidase, which selectively degrades non-HDL cholesterol, leaving only HDL in solution.
The HDL measurement involves the use of an enzyme that catalyzes the conversion of HDL to a photometrically measurable product.
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) I and II are correct.
e) II and III are correct.