What is the purpose of a role?
A. To define exactly what a specific user can do within a particular database once they have been authenticated.
B. To group a collection of privileges together so that they can be simultaneously granted to and revoked from multiple users.
C. To establish a credible relationship between DB2 and an external entity, such as a database administrator or a middleware server.
D. To group a collection of users together so that they can be simultaneously granted and revoked specific authorities and privileges.
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