${?}_{{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_e\text{x}\text{a}\text{m}\text{i}\text{n}\text{e}(s)\text{h}\text{o}\text{w}\text{c}\text{u}\text{s}\text{t}\text{o}\text{m}\text{e}\text{r}\text{s}\text{d}\text{i}\text{f}\text{f}\text{e}\text{r}in\text{t}\text{h}\text{e}\text{i}\text{r}\text{p}\text{r}\text{o}\text{f}\text{i}\text{t}\text{a}\text{b}\text{i}\text{l}\text{i}\text{t}\text{y}\text{.}}$

Question $20$Select one:

$a.$

Price discounting

$b.$

Customer$-$profitability analysis

$c.$

Customer$-cost$ hierarchy

$d.$

Customer$-$price hierarchy

$e.$

Customer revenue analysi