The correct answer is A. By removing that user's security group from the workspace. In Relativity, workspace access is granted through groups , not by attaching workspace rights directly to individual users.
Relativity's official security documentation explains that you set permissions by adding groups to a workspace and configuring those group permissions there. Users then inherit access through their group memberships. As a result, the standard way to secure a workspace from a user is to remove the group that gives that user access, or remove the user from the relevant group.
The other options do not reflect how Relativity security is structured. User profile settings do not control workspace visibility in the manner described. IP-based security is not the mechanism for ordinary workspace access control in this scenario. Instance-level view security is also too narrow and does not remove the user's overall workspace access; even if certain views were restricted, the user could still potentially access the workspace through other permitted objects or tabs. From an RCA perspective, this question tests a foundational principle: workspace security is group-based . Administrators grant or revoke access by managing the relationship between groups and workspaces, then managing which users belong to those groups. Therefore, to secure a workspace from a user, the correct action is to remove the user's access- granting security group from that workspace.