The main benefit of placing users into groups and roles is

A.
Ease of user administration

B.
Increased security

C.
Ease of programmatic access

D.
Automation

Explanation:
A: While placing users into groups and roles can yield in increased security, ease of programmatic access, or automation, the main reason as to why this is done is for the ease of user administration. Efficient management of users requires the assignment of individual accounts into groups or roles. Groups and roles allow rights and privileges to be assigned to groups or a role as opposed to individual accounts. Individual user accounts can then be assigned to one or more groups depending on the access and privileges they require. Page 556.