E$-$tailors, which apply a long$-$tail concept can make money by:

Select one:

a$.$ selling the same product at different prices with only minor tweaks in their design.

b$.$ leveraging customers to promote their products or services.

c$.$ selling the same product to virtually every customer the Internet can reach.

d$.$ offering a selection of products or services vastly greater than conventional retailers.

e$.$ reselling multiple versions of a single product under different brand names.