People turn to groups to perform tasks

A) when the task is beyond the skills and resources of a single person.
B) when the consequences of poor performance would be catastrophic.
C) when the task is so complex that it can only be successfully performed through integrated action.
D) in all the circumstances listed here.

Social networks are a natural tool for bringing together ________,people who engage in similar work,and ________,people who share enthusiasm for a particular product or activity.

A) private networks; public networks
B) virtual networks; brand societies
C) communities of practice; communities of interest
D) special interest groups; word-of-mouth conclaves