Which option is a method of restricting access for users based on user roles and locales?

RBAC allows administrators to define roles that specify which operations a user can perform and locales that specify which portion of the infrastructure (such as specific chassis or service profiles) they can manage, enforcing least-privilege access at a granular level.

An ACE (Access Control Entry) is a single rule within an ACL that permits or denies traffic based on IP addresses or ports; it does not manage user roles or administrative access locales.

LDAP is a directory protocol used to look up and authenticate user credentials; it does not itself define role or locale-based access restrictions.

RADIUS is an AAA protocol that handles authentication and can return authorization attributes, but the role and locale model as a framework is defined by RBAC, not by the RADIUS protocol itself.