What is the best description of Discount for Lack of Control in a private company valuation?

a Discount for Lack of Control is an entity level discount and Discount for lack of maketability in an individual level discount

b Discount for Lack of Control is a discount based upon lack of salability

c Discount for Lack of Control is an individual level discount and Discount for lack of marketability in an entity level discount

d Discount for Lack of Control is based on studies of rectricted private company stocks