Answer:
d) Social networking sites
Step-by-step explanation:
-Intranet is a network that is created by an organization to share information, tools and different services inside the company.
-Wikis are websites used to share content and knowledge and different users can modify the information.
-VoIP is a technology that allows you to make calls over the internet.
-Social networking sites are online platforms that allow people to connect with organizations and other people, create communities online and share different types of information.
-Unified communications is a system that has different communication methods through a single application.
According to this, the collaboration technology that is becoming more and more popular within organizations because it provides a means for forming ad hoc groups, networking and locating potential business allies is social networking sites.