Why might creating role-based groups positively impact the end user experience when working with user/ groups lists?

Why might creating role-based groups positively impact the end user experience when working with user/ groups lists?
A . It increases the complexity of key tasks
B . It eliminates the need to select relevant users individually
C . It eliminates the ability to synchronize with your LDAP server
D . It simplifies access control by enforcing the one-role, one-group rule

Answer: D