____________ is a form of digital marketing that describes the use of the social web and social media (e.g. social networks, online communities, blogs or wikis) or any online collaborative technology for marketing activities, be it sales, public relations, research, distribution or customer service

a) Pay Per Click (PPC)

b) Digital Asset Optimization (DAO)

c) Social Media Marketing (SMM)

d) Search Engine Optimization (SEO)