The Administrators on the Geriatric Unit of University X Healthcare

The administrators on the geriatric unit of University X Healthcare System have a problem. The number of falls on the inpatient unit has increased over the past quarter by 25%. To address this issue, the administration has invited representatives from the medical group, nursing, physical therapy, occupational therapy, and social work to meet and develop an action plan. A representative from each of the invited disciplines has accepted. The first meeting is about to begin.
To distinguish a group from a random collection of people the members must:

A) Have common interests and goals.
B) Have regular patterns of interaction.
C) Exert influence among the members.
D) All of the answers.