What is the purpose of a role?

What is the purpose of a role?
A . To define exactly what a specific user can and cannot do within a particular database once they have
been authenticated
B . To group a collection of users together so that they can be simultaneously granted and revoked
specific authorities and privileges
C . To group a collection of privileges together so that they can be simultaneously granted to and revoked
from multiple users, groups, or other roles
D . To assign one or more users that need to run local DB2 applications and tools on a particular server to
the DB2ADMNS or the DB2USERS group

Answer: C