Terrible Tees is an online $t-$shirt company that invites consumers to enter their $t-$shirt designs in a monthly contest. All visitors to the site are invited to vote on their favorite design, and at the end of he month, the company produces and takes orders for the $t-$shirt design with the most votes. This is an example of

A$.$ the wisdom of crowds

B$.$ the production concept

C$.$ the selling orientation

D$.$ a folksonomy

E$.$ a brandfest