According to the $\_\_\_\_\_\_\_\_$ model, an organization can increase brand awareness or even generate sales by Web$-$based word$-$of$-$mouth marketing or promoting a product or service to other people.

Question $18$Select one:

a$.$

electronic tendering systems

b$.$

name$-$your$-$own$-$price

c$.$

viral marketing

d$.$

online direct marketing