Thedevelopmentoftheinternetoverthepast20yearshasnotonlychangedthewaymostpeoplelivetheirlives,butalsoprovidedaplethoraofnewplatformsforbusiness.Theadvertisingindustryadoptthemicroblogasa()tool,whichisapertinentexample.
A.availability
B.Promotional
C.encryption
D.payment
正确答案是B